Chess AI's Morphy sacrifice lives in one attention head — ablate it and it vanishes
A 31-second demo shows that one of Maia-3's 128 attention heads is almost single-handedly carrying the ability to find Paul Morphy's famous queen sacrifice from the 1858 Opera Game. Knock out that head and the model no longer finds the move; the capability just disappears. It's a vivid, concrete illustration of how sparsely a whole chess skill can be wired into a transformer — and how surgically it could be excised.