这个版本更新了什么#
"Now try it yourself" is now a real turn inside the lesson. In the thirteen lessons that end with an exercise (The Pawn, Castling, Castling Rules, Promotion and En Passant, Scholar's Mate, the five tactics and the three basic checkmates), the last step's own board is the learner's to play: click or drag a White piece, with both drawers open or closed, and the computer answers. Before, that board ignored every click and the drawer's "Try it against the computer" left the lesson for a practice game that replaced the learner's own game, with no way back. That button and its route are gone. The title shows where the exercise stands (Your turn, Computer's turn, Try again, Well done, Play on). The drawer lists what counts as doing it, two hints about the starting position and then a move shown as an arrow, Undo turn and Restart. A move that leaves the taught idea is called out and undone; Castling Rules explains why the other side cannot castle; stalemate in a checkmate lesson is explained rather than counted. The tactics follow an authored line with the computer's best defence; a fixed-depth search checks that the line wins its material against every defence and that no other winning move of the same shape is refused. After success the learner may play on against the beginner opponent. Leaving the step, the lesson or the app keeps the attempt exactly where it was; the computer's turn waits for Resume, as it does while the app is hidden. The practice game is never touched. Narration ending on the exercise never moves on to the next lesson. The Pin's exercise has a new position. In the old one no pin could win material, so "Pin it, attack it, and win material" was not true there; the new board keeps the knight on c6 and the king on e8, so the recorded narration stays word for word. Automated acceptance covered every gate on a second test Mac, including real pointer clicks on the new exercises (castling by click and by drag with the drawers closed, a refused castling explained, a tactic gone off track and undone, the full Fork line and Play on, the promotion menu, and an attempt restored after leaving and after a relaunch). A fixed-depth python-chess search checked every tactic line, and Codex reviewed the change twice. No beginner has yet played the exercises, and their new texts have not had an editorial review. Live voice, translation and recording were not exercised for this release. Requires macOS 14+ with universal Apple Silicon and Intel binaries.
以上是作者写在 GitHub 上的英文更新说明原文，未经翻译。查看原页面