Bertie has a plan: every lesson now starts with one, and the course has grown to 100 lessons, with four real games to play through. Lessons • Each lesson opens on a board of arrows and rings: what to go for, and what to watch out for. Each line's first lesson shows the map of the whole line. • The moves you find name the rule they follow, such as "Meet ...c5 with c3", and an arrow or a ring shows why. • The colours keep one meaning each: green for our plan, gold for our targets, blue for the squares we control and red for Black's threats. • A move you tap in a lesson's words plays where the sentence means it, and the mistakes it names are marked ? or ??. New in the course • Four real games to play move by move: Kamsky v Shankland, 2014, Carlsen v Tomashevsky, 2016, Ding v Nepomniachtchi, 2023, and Jobava v Ponomariov, 2016. • Black's Tenth Move, on the Attack Line: what to play against 10...b6, 10...Nd7??, 10...cxd4 and 10...Ne7. • 87 more drills and 205 more positions cover what club players meet that the course skipped, from the Copycat with ...Nc6 and the Dutch's move orders to the 2...h5 trap on the London bishop. • Two lessons teach a stronger move now: 10.Nxd7 in Knight to e5, and 11.g4 in Tension Released. If you learned the old move, the Commute asks you for the new one. • A lesson you've already finished adds its new positions when you play it again. Until you learn them, your % of the London on You dips a little. The Commute • How the Commute works, in Settings, in Drills and on the reminder page before your first lesson, charts how a position fades when you learn it once, and how the Commute keeps it. Mind the Gap • 92 puzzles, three of them new. Titles name the theme without giving the move away, and four puzzles now play Black's slip before you answer. Fixes • The lock screen widget says "1 position due". • Rush Hour says missed positions go back into your Commute only when some did. • The Commute's step line stays still while a retry shows its grade.

Bertie has new tricks: a tour of the London before your first lesson, reminders that ask you a real position, and 21 new drills. Getting started • "One setup. Every game." plays the London on the board move by move, with Bertie explaining each idea. Pick another first move for Black and see how little White's setup changes. • "Why learn it first" gives four reasons, each with its source, from Ding Liren's World Championship win to how the London scores in club games on Lichess. • Pick a time for your daily reminder before your first lesson. • Bertie answers your name once you stop typing, and the page no longer jumps as you type. Daily reminders • A reminder shows the Commute's first position and asks what White plays there, without giving the move away. • It puts the number of positions due on the app icon. • Tap it to go straight to the Commute or the lesson it names, or press and hold it for "Remind me in an hour". Lessons • 21 new drills cover the positions club players meet most that the course skipped, such as 2...e6 with ...c5, an early ...Bd6 and 1...c6. • A lesson you've already finished adds its new positions when you play it again. Until you learn them, your % of the London on You dips a little. VoiceOver • VoiceOver now reads a quiz's explanation once you answer, "Lesson complete!", where the Explorer's course stops, and Bertie's words after "Add to your next Commute" on a checked game.

Bertie has been busy. This update makes your games, your practice and your progress read right. Game Checkup • Moves the lessons teach now count as book moves, so 4.Nd2 against 3...Bb4+ keeps you in the book. • A game can move between the London and the Jobava London where they meet, and stays in the book. • Games typed with extra detail, such as 4.Ngf3, now read. Practice • "Play it yourself" on a line accepts the alternatives the lessons teach, instead of calling them slips. • In the Commute, finding the move after a slip shows "That's the one" and the lesson's note. • The puzzle of the day changes at your midnight, wherever you are. • Puzzle explanations link more of their moves to the board. Your progress • Positions, Memory and Long-term on You, the widget and the badges count only positions the course still has. • Study and Continue on a line open the next lesson you can play. • The streak reminder and Today's banner suggest only what keeps your streak and what you can open. Sparring Partner • A game drawn by repetition, the fifty-move rule or too little material shows ½ on the evaluation bar. • Closing a game stops the engine thinking. VoiceOver • Each move is read once, as it's played, with castling and captures said in full. • The evaluation bar reads in words, such as "White is better by 0.8 pawns".