Game 68: AB-JChess vs Pikafish, read by both engines

AB-JChess vs Pikafish: two wins, read by both engines

53 moves

Game 68 of the 2026-09-29 match, 400 games at 4 seconds a move: AB-JChess red, Pikafish black. Both engines scored every position again: AB-JChess at 1 million nodes, the fixed Pikafish at 64 million; scores are expected results, a draw counting half. Marks are Pikafish's moves a…

Black's chariot takes a face-down advisor on a1. AB-JChess has Red at 65%; Pikafish, searching this position itself, has Red at 44%. AB-JChess preferred face-down piece h8-f8, but by its count the game move cost under 5 points. Searched longer, AB-JChess keeps its choice (Black 3…

?! By AB-JChess's count this drops Pikafish from 33% to 28%; it preferred face-down piece b10-d9, the line beside this move. Searched longer, AB-JChess keeps its choice (Black 33% against 27%); Pikafish prefers the game move (Black 43% against 33%).

Red's chariot takes the face-down piece on f10, a cannon. AB-JChess has Red at 75%, and never below 69% from here; Pikafish has Red at 55%.

?! By AB-JChess's count this drops Pikafish from 30% to 24%; it preferred face-down piece g7-g6, the line beside this move. Searched longer, AB-JChess switches to the game move (Black 28% against 27%); Pikafish prefers the game move (Black 42% against 10%).

The black horse that came up on b1 takes Red's second advisor. AB-JChess: Red 75%. Pikafish: Red 58%.

?! By AB-JChess's count this drops Pikafish from 25% to 15%; it preferred face-down piece g7-g6, the line beside this move. Searched longer, AB-JChess keeps its choice (Black 21% against 14%); Pikafish prefers the game move (Black 51% against 18%). The horse takes the elephant to…

Red's elephant takes the horse. AB-JChess: Red 86%. Pikafish: Red 49%.

Black turns over b10, a soldier, and Pikafish's own score for Red jumps to 85%. AB-JChess had Red above 80% from move 18.

Black has no legal move and loses.