Black a 1
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White to move Precedent/Chess
Chess where a move is legal only if it has precedent: someone, somewhere, played it from this exact position in a real Lichess game. The deeper you go, the fewer games ever got there, until a single game remains and plays out its real ending.
Pick a move
Only moves actually played from this position are open to you. The small count on each square is how many games chose it.
Positions get rarer
Each position is looked up in the record on its own, whatever the move order. The deeper you go, the fewer real games ever reached it.
One game remains
Once a single game ever reached your position, precedent takes over and plays out its real ending, which you can open on Lichess.
Black White to move