{"schemaVersion":1,"name":"Free Chess Lessons & Interactive Practice","canonicalUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons","inLanguage":"en","dateModified":"2026-10-25","publisher":"Valorem Apps","description":"Pawnpetal browser lessons introduce chess ideas through illustrated examples, guided decisions and fresh positions. They run in a browser without an account or installation. This browser curriculum is separate from Pawnpetal’s native iPhone, iPad and Mac editions and does not reproduce the in-app curriculum.","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice","markdownUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons.md","curriculumEntryCount":123,"scope":"These are original teaching examples and bounded exercises, not full games, computer opponents, forced solutions or engine-certified best moves. Completed activities record practice, not mastery. Illustrative opponent replies are authored examples.","progressStorage":"Learning progress and the last lesson selection are saved in this browser on this device when local storage is available. There is no account or cross-device synchronization. Clearing browser data removes these records. Short guided attempts restart on reload.","practiceAvailability":"Explore an idea, make guided decisions, then try a fresh position when available. Some fresh checks need preparation first. See and Try remain available for exploration. Progress records distinguish exploring a lesson, completing a flow and finding a goal; they do not certify mastery.","faqs":[{"question":"Are these chess lessons free?","answer":"Yes. The browser lessons, guided practice and study downloads on this page are free to use. You do not need an account or the Pawnpetal app to start."},{"question":"Where should a beginner start?","answer":"Start with board fluency if square names or piece moves are new to you, then explore the rules lessons. Before working on a plan, practise the optional safety scan: king, threat, landing square. The five foundation guides introduce central control, development, pawn structure, rook activity and the opponent’s plans."},{"question":"Is this the same curriculum as the Pawnpetal app?","answer":"This is a separate browser learning experience with its own released lessons and examples. It does not reproduce the native app’s curriculum. The iPhone, iPad and Mac editions have their own features and requirements, described on the Pawnpetal app pages."},{"question":"How does the interactive practice work?","answer":"Explore an idea, make guided decisions, then try a fresh position when available. Some fresh checks need preparation first. See and Try remain available for exploration. Progress records distinguish exploring a lesson, completing a flow and finding a goal; they do not certify mastery."},{"question":"Will my progress be saved?","answer":"The garden saves progress and the last selection in this browser on this device when local storage is available. Short guided flows and exercises restart from the beginning on reload. There is no account or cross-device sync. Clearing browser data removes the saved progress."},{"question":"Can I play a full chess game here?","answer":"The browser garden is for lessons and bounded position practice. It does not offer full games or computer opponents. Visit the Pawnpetal app page to compare the native editions and their play modes."},{"question":"Are the example moves forced or engine-certified?","answer":"The foundation lines illustrate legal chess ideas. Opponent replies are authored examples, and other replies may be possible. These are not engine-certified best lines, promises of a win or a complete chess course. Each guide explains its own limits."}],"downloads":[{"id":"petal-five-lesson-lines.pgn","name":"Five foundation lesson lines","format":"PGN","url":"https://valorem.ing/assets/petal-lessons/9ad8d60c0e9348ac/downloads/petal-five-lesson-lines.pgn","bytes":11082},{"id":"petal-six-chess-positions.pdf","name":"Six chess practice positions","format":"PDF","url":"https://valorem.ing/assets/petal-lessons/9ad8d60c0e9348ac/downloads/petal-six-chess-positions.pdf","bytes":56313},{"id":"petal-answer-key.pdf","name":"Practice answer key","format":"PDF","url":"https://valorem.ing/assets/petal-lessons/9ad8d60c0e9348ac/downloads/petal-answer-key.pdf","bytes":47058},{"id":"petal-library-session.pdf","name":"A 25-minute table session","format":"PDF","url":"https://valorem.ing/assets/petal-lessons/9ad8d60c0e9348ac/downloads/petal-library-session.pdf","bytes":52384},{"id":"petal-reflection-worksheet.pdf","name":"One-decision reflection worksheet","format":"PDF","url":"https://valorem.ing/assets/petal-lessons/9ad8d60c0e9348ac/downloads/petal-reflection-worksheet.pdf","bytes":67471},{"id":"petal-questions.pgn","name":"Six tactical questions","format":"PGN","url":"https://valorem.ing/assets/petal-lessons/9ad8d60c0e9348ac/downloads/petal-questions.pgn","bytes":2643},{"id":"petal-answers.pgn","name":"Six tactical answers","format":"PGN","url":"https://valorem.ing/assets/petal-lessons/9ad8d60c0e9348ac/downloads/petal-answers.pgn","bytes":4399},{"id":"petal-positions.fen","name":"Six starting positions","format":"FEN","url":"https://valorem.ing/assets/petal-lessons/9ad8d60c0e9348ac/downloads/petal-positions.fen","bytes":212},{"id":"petal-library-session.txt","name":"Table session accessible text","format":"TXT","url":"https://valorem.ing/assets/petal-lessons/9ad8d60c0e9348ac/downloads/petal-library-session.txt","bytes":7136},{"id":"petal-complete-sampler.zip","name":"Six-position tactics sampler","format":"ZIP","url":"https://valorem.ing/assets/petal-lessons/9ad8d60c0e9348ac/downloads/petal-complete-sampler.zip","bytes":115789}],"foundations":[{"id":"centre-control","name":"Make the centre work for you","description":"Central control gives your pieces options. 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A small preventive move can make that plan harder.","url":"https://valorem.ing/apps/pawnpetal-chess/lessons/opponent-plans","markdownUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/opponent-plans.md","teaches":["First check immediate checks, captures and threats.","Then ask which useful move the opponent wants.","Prevent a real idea, but do not defend against everything."]}],"entries":[{"id":"read-a-square","name":"Read a square","description":"Locate a named square from either board orientation.","kind":"concept","track":"fluency","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/fluency/read-a-square"},{"id":"trace-a-rook-ray","name":"Trace a rook ray","description":"Mark reachable rook squares up to the first occupied square.","kind":"concept","track":"fluency","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/fluency/trace-a-rook-ray"},{"id":"trace-a-bishop-ray","name":"Trace a bishop ray","description":"Mark reachable bishop squares and explain same-color travel.","kind":"concept","track":"fluency","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/fluency/trace-a-bishop-ray"},{"id":"combine-queen-rays","name":"Combine queen rays","description":"Distinguish a queen's orthogonal and diagonal routes from knight routes.","kind":"concept","track":"fluency","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/fluency/combine-queen-rays"},{"id":"jump-with-a-knight","name":"Jump with a knight","description":"Find knight destinations despite intervening blockers.","kind":"concept","track":"fluency","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/fluency/jump-with-a-knight"},{"id":"move-a-pawn","name":"Move a pawn","description":"Distinguish forward movement from diagonal capture and blocked double steps.","kind":"concept","track":"fluency","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/fluency/move-a-pawn"},{"id":"read-a-defended-square","name":"Read a defended square","description":"Identify which pieces geometrically defend a named occupied square.","kind":"concept","track":"fluency","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/fluency/read-a-defended-square"},{"id":"follow-the-turn","name":"Follow whose turn it is","description":"Replay alternating legal moves and identify the resulting side to move.","kind":"concept","track":"fluency","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/fluency/follow-the-turn"},{"id":"safe-king-step","name":"Find a safe square","description":"Move the king to any legal adjacent square.","kind":"rule","track":"rules","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/rules/safe-king-step"},{"id":"answer-check","name":"Answer the check","description":"Escape check by moving the king, capturing the checker, or blocking a line.","kind":"rule","track":"rules","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/rules/answer-check"},{"id":"mate-or-stalemate","name":"Mate or no moves?","description":"Distinguish checkmate, stalemate, and a position with legal moves.","kind":"rule","track":"rules","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/rules/mate-or-stalemate"},{"id":"castle-through-safety","name":"Castle through safety","description":"Castle only when path, king safety, and move history allow it.","kind":"rule","track":"rules","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/rules/castle-through-safety"},{"id":"en-passant-now","name":"A one-turn chance","description":"Recognize immediate en passant and reject expired or king-unsafe captures.","kind":"rule","track":"rules","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/rules/en-passant-now"},{"id":"choose-promotion","name":"Choose the new piece","description":"Choose a legal promotion that gives mate or leaves an opponent reply.","kind":"rule","track":"rules","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/rules/choose-promotion"},{"id":"centre-control","name":"Centre control","description":"Challenge a foothold. Bring a piece.","kind":"foundation","track":"foundation","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#lesson/centre-control"},{"id":"development-and-safety","name":"Development & safety","description":"Give your pieces jobs. Shelter the king.","kind":"foundation","track":"foundation","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#lesson/development-and-safety"},{"id":"pawn-structure","name":"Pawn structure","description":"Read the chain. Notice what opens.","kind":"foundation","track":"foundation","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#lesson/pawn-structure"},{"id":"piece-activity","name":"Rook activity","description":"Find a route. Create useful pressure.","kind":"foundation","track":"foundation","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#lesson/piece-activity"},{"id":"opponent-plans","name":"Opponent plans","description":"Notice their idea. Reassess after a move.","kind":"foundation","track":"foundation","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#lesson/opponent-plans"},{"id":"safety-scan","name":"Before your plan","description":"Optional safety habit: king, threat, landing square.","kind":"chapter","track":"readiness","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/readiness/safety-scan"},{"id":"choose-the-need","name":"Choose the need","description":"Optional mixed practice: compare safety, trades and useful pieces.","kind":"chapter","track":"readiness","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/readiness/choose-the-need"},{"id":"trade-for-a-reason","name":"Trade for a reason","description":"Compare the position left by a capture and recapture.","kind":"chapter","track":"exchange","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/exchange/trade-for-a-reason"},{"id":"count-what-comes-back","name":"Count what comes back","description":"Count the material after the opponent recaptures.","kind":"chapter","track":"exchange","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/exchange/count-what-comes-back"},{"id":"give-one-piece-a-better-job","name":"Give one piece a better job","description":"Name a job, trace a route, recheck the reply.","kind":"chapter","track":"piece-improvement","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/piece-improvement/give-one-piece-a-better-job"},{"id":"uncover-a-line","name":"Uncover a line","description":"Move a blocker to reveal a rook or bishop 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king.","kind":"tactic","track":"tactic","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#tactic/3"},{"id":"tactic-4","name":"Back rank mate","description":"Test captures, blocks and king escapes.","kind":"tactic","track":"tactic","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#tactic/4"},{"id":"tactic-5","name":"Stalemate trap","description":"Compare stalemate with checkmate.","kind":"tactic","track":"tactic","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#tactic/5"},{"id":"tactic-6","name":"Protected promotion","description":"Promote with the help of your king.","kind":"tactic","track":"tactic","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#tactic/6"},{"id":"pawn-fork","name":"Two pawn targets","description":"Move a pawn to attack both named targets.","kind":"concept","track":"ideas","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/ideas/pawn-fork"},{"id":"queen-double-attack","name":"One queen, two jobs","description":"Attack both named targets with a queen that cannot be captured immediately.","kind":"concept","track":"ideas","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/ideas/queen-double-attack"},{"id":"exploit-absolute-pin","name":"Use the king pin","description":"Capture the named target while its pinned guard cannot recapture; allow no immediate recapture.","kind":"concept","track":"ideas","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/ideas/exploit-absolute-pin"},{"id":"king-skewer","name":"Look behind the king","description":"Give check on a line with the king between the checker and the named rear 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rook.","kind":"concept","track":"endings","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/endings/rook-behind-passer"},{"id":"two-rook-finish","name":"Finish with two rooks","description":"Give checkmate in one: one rook closes the escape rank, the other checks.","kind":"concept","track":"endings","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/endings/two-rook-finish"},{"id":"queen-king-finish","name":"Let the king help","description":"Give checkmate in one with queen and king coordination.","kind":"concept","track":"endings","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/endings/queen-king-finish"},{"id":"rook-king-finish","name":"Close the last rank","description":"Give checkmate in one with the king covering the escape squares and the rook checking along the edge.","kind":"concept","track":"endings","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/endings/rook-king-finish"},{"id":"answer-with-check","name":"Check while getting safe","description":"Answer the current check with a legal move that also checks the opposing king.","kind":"concept","track":"endings","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/endings/answer-with-check"},{"id":"remove-the-guard","name":"Remove the guard","description":"Capture the named defender, leaving the named target with no defenders and still attacked by your named teammate.","kind":"concept","track":"tactics","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/tactics/remove-the-guard"},{"id":"interrupt-the-guard","name":"Break the support line","description":"Interpose a piece between the named defender and target, leaving that target still attacked by your named teammate.","kind":"concept","track":"tactics","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/tactics/interrupt-the-guard"},{"id":"clear-a-landing-square","name":"Make room for a teammate","description":"Move the piece occupying the named landing square so your named knight has room to jump there.","kind":"concept","track":"tactics","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/tactics/clear-a-landing-square"},{"id":"check-before-recapture","name":"Pause before recapturing","description":"Capture the named bonus piece with check; after every legal reply, recapture the piece that just took yours.","kind":"concept","track":"tactics","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/tactics/check-before-recapture"},{"id":"draw-the-guard-away","name":"Pull the defender away","description":"Give check so every legal reply moves the named defender off its support job; then capture the named target with the stated minimum material gain.","kind":"concept","track":"tactics","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/tactics/draw-the-guard-away"},{"id":"build-a-rook-battery","name":"Let the rooks work together","description":"Move one rook so both rooks share an unobstructed file and neither can be legally captured on the opponent’s next move.","kind":"concept","track":"tactics","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/tactics/build-a-rook-battery"},{"id":"choose-safe-retreat","name":"Choose a safe retreat","description":"Save an attacked piece to a square with no immediate legal capture.","kind":"concept","track":"defense","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/defense/choose-safe-retreat"},{"id":"add-a-defender","name":"Add a defender","description":"Defend a threatened piece while keeping the defender itself tactically viable in the stated 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pieces.","kind":"concept","track":"mates","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/mates/smothered-knight-mate"},{"id":"boden-crossed-diagonals","name":"Boden’s mate","description":"Deliver a bishop mate while the other bishop controls separate flights and enemy pieces block the remaining side.","kind":"concept","track":"mates","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/mates/boden-crossed-diagonals"},{"id":"dovetail-supported-queen","name":"Dovetail mate","description":"Place a supported queen beside a king whose own pieces occupy the two otherwise uncovered flights.","kind":"concept","track":"mates","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/mates/dovetail-supported-queen"},{"id":"opera-rook-bishop","name":"Opera mate","description":"Mate with an adjacent rook protected by a bishop that also covers a king 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moves.","kind":"concept","track":"recognition","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/recognition/play-the-notation"},{"id":"recognize-dead-material","name":"Elementary dead positions","description":"Identify K versus K, K+B versus K and K+N versus K without generalizing all minor-piece endings.","kind":"concept","track":"recognition","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/recognition/recognize-dead-material"},{"id":"identify-a-passed-pawn","name":"Identify a passed pawn","description":"Test enemy pawns on the same and adjacent files ahead, not merely whether the forward square is empty.","kind":"concept","track":"recognition","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/recognition/identify-a-passed-pawn"},{"id":"create-a-protected-passer","name":"Create a protected passer","description":"Use a legal pawn transformation to create a passed pawn defended by another pawn.","kind":"concept","track":"recognition","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/recognition/create-a-protected-passer"},{"id":"read-a-relative-pin","name":"Read a relative pin","description":"Separate an illegal king-exposing move from a legal move that exposes a queen, and notice a checking exception.","kind":"concept","track":"calculation","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/calculation/read-a-relative-pin"},{"id":"place-the-checking-blocker","name":"Aim the discovered check","description":"Choose a legal blocker destination that uncovers check and attacks the queen, then passes the bounded material test.","kind":"concept","track":"calculation","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/calculation/place-the-checking-blocker"},{"id":"use-the-xray-recapture","name":"Count the x-ray defender","description":"See a rear slider become a legal recapturer when the front slider is exchanged, then test a pinned-defender exception.","kind":"concept","track":"calculation","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/calculation/use-the-xray-recapture"},{"id":"count-the-capture-ladder","name":"Count the capture ladder","description":"Choose an initiating capture by its legal recapture sequence, including a five-capture ladder and a pinned-defender change.","kind":"concept","track":"calculation","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/calculation/count-the-capture-ladder"},{"id":"compare-the-full-position","name":"Compare the full position","description":"Compare two legal move orders by placement, side to move, castling rights and legal en-passant availability.","kind":"concept","track":"positional","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/positional/compare-the-full-position"},{"id":"remove-the-pawn-anchor","name":"Remove a knight’s pawn 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wall.","kind":"concept","track":"positional","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/positional/swing-above-the-pawns"},{"id":"build-a-supported-contact","name":"Build a supported pawn contact","description":"Advance a pawn into a newly supported attack on an enemy pawn, checking the exchange and any line opened behind it.","kind":"concept","track":"positional","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/positional/build-a-supported-contact"},{"id":"exploit-two-defensive-duties","name":"One guard, two duties","description":"Exploit two simultaneously guarded targets, then reject a tempting capture order when a checking reply or second defender changes the result.","kind":"concept","track":"resources","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/resources/exploit-two-defensive-duties"},{"id":"draw-the-king-into-a-tactic","name":"Draw the king into a tactic","description":"Use a checking offer to force a king capture onto a square that enables a fork, counting the entire exchange.","kind":"concept","track":"resources","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/resources/draw-the-king-into-a-tactic"},{"id":"insert-a-nonchecking-threat","name":"Threaten before recapturing","description":"Interrupt a pending exchange with a nonchecking threat, then account for defenses and counterchecks instead of assuming a forced recapture.","kind":"concept","track":"resources","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/resources/insert-a-nonchecking-threat"},{"id":"close-the-bishop-retreat","name":"Close the last retreat","description":"Attack a restricted bishop while closing its remaining safe diagonal, and verify a net material gain after every legal defense.","kind":"concept","track":"resources","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/resources/close-the-bishop-retreat"},{"id":"spend-a-doomed-piece","name":"Get something before it falls","description":"Verify that a piece can be captured after every legal first move, then extract the most useful material before losing it.","kind":"concept","track":"resources","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/resources/spend-a-doomed-piece"},{"id":"compare-forcing-candidates","name":"Compare forcing candidates","description":"Compare two named legal candidate trees, checking the opponent’s replies rather than promoting every check above a capture.","kind":"concept","track":"process","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/process/compare-forcing-candidates"},{"id":"finish-the-calculation-line","name":"Stop at a settled leaf","description":"Keep calculating an exchange branch through legal recaptures and check evasions, then evaluate only a defined quiet or terminal endpoint.","kind":"concept","track":"process","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/process/finish-the-calculation-line"},{"id":"update-the-moving-defender","name":"Update the moving defender","description":"Recompute all legal recapturers after a defender relocates, then execute the capture test on the changed board.","kind":"concept","track":"process","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/process/update-the-moving-defender"},{"id":"recognize-repetition-state","name":"Count the same position","description":"Replay a legal history, identify all earlier occurrences of the current full position, and distinguish current threefold eligibility from automatic fivefold repetition.","kind":"concept","track":"foundations","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/foundations/recognize-repetition-state"},{"id":"inventory-immediate-danger","name":"Inventory immediate danger","description":"After each actual legal candidate reply, find every opponent mate in one and every capture of a non-pawn piece that has no legal immediate same-square recapture; then replay each listed danger.","kind":"concept","track":"foundations","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/foundations/inventory-immediate-danger"},{"id":"shrink-the-queen-barrier","name":"Shrink the queen barrier","description":"Identify a queen’s rectangular barrier, find every nonchecking queen move that strictly shrinks it without immediate queen capture or stalemate, and verify the resulting king replies.","kind":"concept","track":"foundations","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/foundations/shrink-the-queen-barrier"},{"id":"approach-with-the-queen-barrier","name":"Approach without closing the cage","description":"Find every legal king move that reduces file-plus-rank distance to the enemy king while preserving the queen barrier, allowing a reply and preventing immediate queen capture; verify all enemy replies.","kind":"concept","track":"foundations","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/foundations/approach-with-the-queen-barrier"},{"id":"account-for-opening-tempi","name":"Opening moves have a cost","description":"Compare activity, material and repeated minor moves in two shown opening lines.","kind":"concept","track":"opening","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/opening/account-for-opening-tempi"},{"id":"develop-against-the-queen-threat","name":"Develop 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Meet every promotion by a safe bishop capture or an immediate dead-material draw.","kind":"concept","track":"decisions","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/decisions/cover-every-promotion-lane"},{"id":"keep-a-second-pawn-tempo","name":"Keep a second pawn tempo","description":"Make a safe, quiet pawn step without check or promotion. Keep a second such move after any reply, without moving your king.","kind":"concept","track":"decisions","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/decisions/keep-a-second-pawn-tempo"},{"id":"keep-the-next-side-check","name":"Keep the next side check","description":"Give a safe, noncapturing rook check along the king’s rank from the pawn’s longer file-side. Keep a second such check after any reply.","kind":"concept","track":"decisions","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/decisions/keep-the-next-side-check"},{"id":"coordinate-both-bishop-colors","name":"Coordinate both bishop colors","description":"Open complementary bishop routes without reblocking a partner, then recognize a changed blocker or immediate capture danger.","kind":"concept","track":"coordination","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/coordination/coordinate-both-bishop-colors"},{"id":"compare-minor-piece-mobility","name":"Compare minor-piece mobility","description":"Compare bounded safe quiet mobility before and after a pawn change, choose a genuinely newly usable bishop destination, and identify one causal obstruction or capture.","kind":"concept","track":"coordination","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/coordination/compare-minor-piece-mobility"},{"id":"deny-entry-keep-the-guard","name":"Deny entry, keep the guard","description":"Make one rook relocation that preserves two defensive jobs, execute a representative entry capture, and diagnose a changed failure.","kind":"concept","track":"coordination","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/coordination/deny-entry-keep-the-guard"},{"id":"exchange-and-remap-entries","name":"Exchange and remap entries","description":"Play a specified equal bishop exchange, redraw its small named knight-entry map, and recognize a surviving defender.","kind":"concept","track":"coordination","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/coordination/exchange-and-remap-entries"},{"id":"compare-the-defenders-replies","name":"Check their in-between move","description":"Compare two named defensive replies within a nine-ply material test.","kind":"concept","track":"replies","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/replies/compare-the-defenders-replies"},{"id":"reject-a-false-sacrifice","name":"Reject a false sacrifice","description":"Find a defense to the advertised sacrifice in a seven-ply material test.","kind":"concept","track":"replies","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/replies/reject-a-false-sacrifice"},{"id":"fork-with-a-line-piece","name":"Fork with a rook or bishop","description":"Create attacks on both named targets with a rook or bishop, and leave that slider unavailable to every immediate legal capture.","kind":"concept","track":"structural","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/structural/fork-with-a-line-piece"},{"id":"identify-isolated-pawns","name":"Separate isolated from passed","description":"Identify every friendly isolated pawn and every friendly passed pawn as two independent board properties.","kind":"concept","track":"structural","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/structural/identify-isolated-pawns"},{"id":"map-pawn-islands","name":"Map pawn islands","description":"Partition all friendly pawns into adjacent-file-connected islands, then recompute the full partition after a legal capture.","kind":"concept","track":"structural","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/structural/map-pawn-islands"},{"id":"undouble-with-recapture","name":"Undouble only within a material bound","description":"Find every legal recapture that reduces doubled-pawn excess without violating the explicit short material floor, and distinguish a cleared ray segment from an open file.","kind":"concept","track":"structural","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/structural/undouble-with-recapture"},{"id":"convert-with-a-reply","name":"Leave the king a move","description":"Bring your king closer without stalemating the bare king or offering your major piece; recognize checkmate as a different successful finish.","kind":"concept","track":"conversion","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/conversion/convert-with-a-reply"},{"id":"inspect-the-final-capture","name":"Inspect the final capture","description":"Choose which piece takes the final enemy unit by inspecting the resulting full legal-move set, not material alone.","kind":"concept","track":"conversion","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/conversion/inspect-the-final-capture"},{"id":"open-a-real-flight","name":"Open a real flight","description":"Meet a concrete back-rank mate threat by vacating a pawn square the king can legally use, while preventing every immediate mate reply.","kind":"concept","track":"conversion","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/conversion/open-a-real-flight"},{"id":"trade-material-for-time","name":"Give material to stop mate","description":"Capture an attacking unit with a more valuable piece, allow its recapture, and remove an explicitly verified short mate threat.","kind":"concept","track":"conversion","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/conversion/trade-material-for-time"},{"id":"find-a-quiet-mating-move","name":"Quiet move, forced mate","description":"Find a nonchecking, noncapturing first move after which every legal reply permits mate in one.","kind":"concept","track":"forcingendgames","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/forcingendgames/find-a-quiet-mating-move"},{"id":"verify-every-mating-branch","name":"Check every defense","description":"For a supplied first move, enumerate all legal defenses and play a mating response to each; find a counterexample when the defense set changes.","kind":"concept","track":"forcingendgames","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/forcingendgames/verify-every-mating-branch"},{"id":"offer-a-stalemate-resource","name":"Offer a stalemate resource","description":"Offer a nonking piece so every legal immediate capture of that offered piece produces stalemate, without assuming the opponent accepts.","kind":"concept","track":"forcingendgames","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/forcingendgames/offer-a-stalemate-resource"},{"id":"promote-or-take-the-target","name":"Make promotion earn a tempo","description":"Create an immediate promotion threat whose stopping replies allow another capture, with a verified two-point material gain retained through the next opposing move.","kind":"concept","track":"forcingendgames","practiceUrl":"https://valorem.ing/apps/pawnpetal-chess/lessons/practice#node/forcingendgames/promote-or-take-the-target"}]}