CHESSLAB 2.0 DAILY SESSION Every day, the app gathers what to review: opening positions that are due, missed puzzles, an endgame. A streak of days, medals — and a counter that stops once you have done your part. YOUR MISTAKES BECOME PUZZLES When an analysis ends, the app offers to create puzzles from the game: the mates you let slip and your costliest mistakes, shown on small boards. You accept or decline; nothing is created without you. A weakness profile builds up in Progress: phases, themes, trends. THE COACH Under a mistake, one sentence tells you what share of players at your level play that move: a typical mistake, an accident, or a rare find that few players spot. Computed on your device by Maia-3. YOUR PUZZLE RATING A personal rating that moves with every puzzle, and “At my level” to meet problems that fit you. OPENINGS Illustrated cards, filters by side and by level, and the 19 “classics” grouped together. RESUME A GAME An interrupted game resumes in one tap from the settings screen, and the app asks before replacing it with a new one. OPTIONAL TIME LIMIT One switch, and the app remembers your last choice. FIXES • A game resumed after a rook was captured on its corner could crash the app: fixed. • A game ending in checkmate was never graded to the end, so its accuracy and the puzzles from your mistakes were missing. Fixed.

CAPTURING BY TAPPING, ON IOS 18 On iOS 18, tapping your piece and then the opponent's piece to capture did nothing: only dragging could capture. It is fixed, wherever the board is played — games, puzzles, analysis, variants — and checked on an iPhone running iOS 18.

A SQUARE THAT STOPPED RESPONDING On iOS 18, the piece standing in the top-left corner of the board could no longer be touched: h1 when playing Black, a8 when playing White. It was reported while trying to move a queen from h1, mid-game against Maia. It is fixed, wherever the board is played, and checked on an iPhone running iOS 18. Many thanks for such a precise report. THE SCANNER TOO Manual cropping had the same flaw on iOS 18: a corner placed at the very top left of the image could stop responding. The four corners are now picked up by whichever is closest to your finger.

CHESSLAB UNFOLDS WITH IPHONE DUO Closed, the outer display shows ChessLab as you know it on iPhone, with toolbars standing vertically below the status bar. Open, the large display takes the iPad layout — sidebar of modes and detail column — and the board gets all the room it deserves. A BOARD SIZED FOR THE OPEN DISPLAY In a game, an analysis or a training session, the sidebar steps aside on its own whenever it would take the board's room, and comes back as soon as you return to the lists; its button brings it back at any time. Controls move to the right of the board whenever the display is wider than tall, and the board takes the full height: against the computer, in analysis, in the twelve variants, in training and in the Laboratory. EVERY POSE OF THE DEVICE Open, ChessLab follows the device when you turn it, and picks its layout from the actual room on screen. Closed, it stays in portrait, like on any iPhone. ALSO Endgame free training now fills the whole screen on iPad in landscape, with no black bands on the sides.

YOUR NAME, AT LAST Settings → Your name: the name you play under shows on your plate, in the library and in the games you export. Leave the field empty and it reads "You". Along the way, that name now follows the interface language — in English it says "You", including in games already recorded, where it used to stay French. AN EXPORTED PGN IS A REAL PGN A game shared or copied carried only the moves: no headers, no result. It now carries the seven tags of the standard — event, site, date, round, White, Black, result — and the result closes the moves too. The headers of an imported PGN are never overwritten: only the gaps are filled. The twelve variants benefit as well, and games already stored are completed when you reopen them. IPAD: SHARED WINDOWS, AND ROOM FOR THE BOARD In a window shrunk to share the screen with another app, ChessLab kept its two columns: the sidebar took its full place, and the board was left with less width than on an iPhone. Below the width of the narrowest iPad, the app now takes the iPhone layout — one column, board at full width. Where the two columns remain, the board serves itself first: it gains up to 15 % in landscape, and the whole width in portrait when the sidebar is folded. MEMORISATION One more card in Progress: positions seen, acquired, to firm up, due today, reviews this week and success rate. Spaced repetition finally shows what it does with your reviews. DETAILS Evaluation bar on by default in every mode that offers it. In Duck Chess, taking the king is no longer announced as "checkmate" but as "king captured" — the duck hides the move to come, and the game is won by taking the king. VoiceOver move announcements revised. The scanner's detector is declared on the Licences screen.

NINE CHARACTERS TO FACE Next to Stockfish's Elo level, pick an opponent with a personality: Lena the attacker, Nils the wall, Milo the gambiteer, Nadia the technician, Sacha the trapper, Ana the counter-attacker, Yuri the materialist, Pablo the impulsive one, and Maia the reference. They are played by Maia-3, a network trained on millions of human games: it does not look for the best move, it plays the one a human of that level would play — blunders included when the level is low. Each has a style, an opening repertoire, a temperament and an illustration; the level is set and remembered per character, on the human scale (close to Lichess). Everything runs on the device, offline. STOCKFISH ANALYZES, AND COVERS Hints, blunder alert, evaluation bar and analysis are still Stockfish's. Behind a character it only steps in for a short mate, an endgame with few pieces or a repetition in a won position — and the end-of-game screen says so. PROGRESS AND LAB Your record against each character, with the highest level beaten. In the Lab, one side can be played by Maia. FOUR MORE VARIANTS — THE HUB GROWS TO 12 Crazyhouse (captures switch sides and get dropped back), Duck Chess (a duck blocks a square, two-part turns), Barricades (d4 and e5 walled) and Random Barricades (the walls move after every move). All against the computer, post-game analysis included. A GUIDED TOUR, AND VARIANT ANALYSIS COMPLETE Eleven short steps on first launch, replayable from Help. All twelve variants get the same analysis as the classic mode: curve, per-color accuracy, colored inline moves. "Offer a draw" works everywhere. RELIABILITY AND LAYOUT Six engine failure mechanisms fixed in depth; above 2850, variant strength is no longer limited instead of silently dropping to 1350; mode grid on the iPad and Mac home; layout revisited on large windows and small iPhones.

NEW: THE VARIANTS MODULE Chess960 (Fischer Random Chess) joins the app: a randomly drawn starting position, one chosen by number (0-959), or one you compose yourself. Play against the computer or two players, with a full post-game analysis, just like "Play" mode. Three more variants, in a tile-based hub: King of the Hill, Three-Check and Horde — each against the computer with hints, blunder alerts and an eval bar. OPENINGS: A NEW READER The index becomes a tree of lines: every move appears only once. Under a fixed board: the moves masters actually played with their percentages, Stockfish's top three moves, and an eval bar — all precomputed, never a wait. ENDGAMES: 78 COURSES, AND A SEARCH FIELD "Electric Pawns" joins the catalogue. A fixed lesson (the distant passed pawn), and a search-by-name field, just like Openings. THE MODES TALK TO EACH OTHER, THE SAME WAY EVERYWHERE "Switch mode" — which jumps to the Laboratory, the computer or a two-player game while carrying the displayed position along — now looks the same across all nine relevant screens, instead of being buried in an export menu. ALSO Resuming a reviewed move now acts on the first tap, with an undo available. The board theme is now chosen only in Settings. The Laboratory explains each statistic with a tap. And a fresh install now takes 60MB instead of 175.

NEW: THE ENDGAMES MODULE — 77 PROVEN COURSES From the opposition to the Lucena, from fortresses to famous studies (Lasker, Troitsky, Kubbel…), 77 courses in nine families to finally convert your endings. Every line is verified against endgame tablebases — the exact mathematical verdict: no taught move gives up a win, no recommended defence loses a draw. Spaced repetition and iCloud sync, like the openings. FREE ENDGAME TRAINING Finish the position against best defence: any move that preserves the verdict is accepted — not just the lesson's move. A move that lets the win slip is taken back, best move shown, and "clean conversion" has to be earned. YOUR OWN OPENING REPERTOIRES Import a repertoire as PGN — variations included — drill it with spaced repetition, edit it in the app and share it as a single file, no account and no server. ALL 58 OPENINGS EXPANDED AND REVIEWED Nearly 900 positions added: the replies club players actually play (the London against 1.d4 defences, the Philidor, the Petroff…). And every move in the catalogue is replayed under Stockfish before release. THE MODES TALK TO EACH OTHER "Switch mode" jumps to the Laboratory, the computer or a two-player game, carrying the displayed position along — from a puzzle, a course or a game. The export menu also sends the position to analysis; your game is waiting when you come back. SAFER, FAIRER ANALYSIS Borderline verdicts are re-examined with ten times the effort before being labelled: 85% fewer mislabels. The accuracy score is no longer inflated by already-won positions, and the app explains WHY a move is a mistake. "Analyse PGN / FEN" recognises what's in your clipboard by itself. PUZZLES One attempt by default, the way a calculation exercise should work (three attempts available in Settings). Reports by theme, and targeted sets on your weaknesses from the Progress screen — now filterable to 7 or 30 days. THE BOARD FINALLY ANSWERS YOUR FINGER Major fix for iOS 18, where no piece responded to touch. And everywhere: releasing a piece slightly off-square still plays the move, and the target square lights up while you drag. ALSO Stockfish 17.1. Duplicate-free library with game deletion. Opening reader with an anchored board. Help reachable from the home screen. iPhone in portrait, iPad full-page sheets, no text overflow anywhere.

THE BOARD FINALLY ANSWERS YOUR FINGER Releasing a piece slightly off the intended square still plays the move, the way the major chess sites do. The target square lights up while you drag, the legal move dots follow the piece you are holding, and the piece lifts instead of hiding under your finger. Tap-to-move gets the same tolerance. Backing out stays free: releasing on the starting square cancels nothing but the gesture. FAIRER ANALYSIS The accuracy score is no longer inflated by endgame moves played in an already-won position: every move now counts for what was actually at stake. An analysis left too quickly could stay stuck on "Engine idle" with no graph and no classified moves — it now resumes on its own, right where it stopped. PLAY Controls merged into a single row. The "risky move" warning now reasons in win probability instead of a raw threshold: it speaks up when the game really turns, and stays quiet once it is decided. The clock counts from the first move. LAYOUT iPhone locked to portrait, where the board stays large. No horizontal overflow left, even at the largest text size. On iPad, a game in progress survives switching to Split View. FIXES PGN import from the web, starting position preserved on export, English translations completed, and two screens can no longer fight over the engine.

OPENINGS — COMPLETELY REBUILT • A simple, guided reader: Pick an opening, then step through it move by move. Every move is explained, and playable alternatives are clearly offered. • 58 hand-written openings, bilingual (French / English) with verified main lines: covers all major openings (Ruy Lopez, Italian, Sicilian Najdorf/Dragon/Sveshnikov/Taimanov, French, Caro-Kann, King's Indian, Nimzo-Indian, Grünfeld, Queen's Gambit...) plus many systems and gambits. • Colored arrows on the board linked to the move list: green = recommended move, blue = alternatives, red = trap, orange = inaccuracy. • Simplified training: Spaced repetition runs automatically. Recall the move and tap "Continue" — your review schedule is managed automatically with no extra setup. • Alphabetically sorted list, French opening names, and progress synced via iCloud (when enabled). IPAD & MAC • Redesigned interface: A persistent sidebar (modes + tracking) with a dedicated detail area replaces the scaled-up phone layout. (iPhone keeps its tile grid). • Edge-to-edge board in "Play vs the computer" (full height in landscape, full width in portrait). Two Players and Puzzles adapt seamlessly to large screens. • Pointer & trackpad support with cursor highlighting on active squares. • Mac keyboard shortcuts for every mode. ICLOUD SYNC (OPTIONAL) • Turn it on in Settings: Your games, puzzle progress, and openings follow you across devices via your private iCloud. No account required, no third-party server. Off by default — works fully offline. ANALYZE, PUZZLES & PROGRESS • Analyze step-by-step: Walk through Stockfish's best continuation one half-move at a time. • Progress Dashboard: Track your record against the computer and your puzzle stats on the home screen, with targeted puzzle sets available in one tap for weak themes. • Scanner upgrades: Added a processing indicator, off-main-thread processing, and significantly improved piece recognition reliability. COMFORT & SETTINGS • "Play vs the computer": The opponent is now simply called "the computer" (Stockfish is still credited in Help & Licenses). • Board & piece themes: Select from 4 board styles and 3 piece sets with live previews in Settings. • Contact support: Added "Contact the developer" under Help to send feedback or report bugs directly by email. FIXES & UNDER THE HOOD • Fixed a potential crash when exiting the Analysis screen and hardened engine lifecycle management. • Stockfish recompiled from source with ARM (NEON) optimizations running off the main thread — faster analysis with zero UI stutter. • Post-game analysis is now served from cache to prevent recomputing engine evaluations on previously reviewed moves.