4 ms·
RE your nitpick: Fair point. I hadn’t seen the pinning tactic after 140. Ra6 Rxh5??? 141. Ra5+ As is probably obvious from that oversight, I am not a very stro
by umanwizard 7y ago
RE your nitpick: Fair point. I hadn’t seen the pinning tactic after 140. Ra6 Rxh5??? 141. Ra5+
As is probably obvious from that oversight, I am not a very strong player.
However, I still see no way for white to make progress. After 140. Ra6, black just walks its king towards the white pawn. White’s only options then are to give perpetual check with the rook, or to give up the pawn.
It’s plausible to me why lc0 doesnt see this — I guess it is just searching down random paths involving useless rook moves forever, and never gets to the end of the tree. I’m more curious about how Stockfish is able to prove it’s a draw.
Edit: after poking around the Stockfish code a bit, I think what's going on is that Stockfish sees that down every non-pruned path of the tree, either player has the ability to give check, so neither player can be ahead (basically each side has a perpetural check). Would love if any Stockfish expert reading this can comment on whether that's a valid understanding.