rn5r/p1pk1p1p/1p2p1pb/3p1bP1/3PPB2/1P6/P1P1NP1P/1R1NKn1R b - - 0 18
FEN state: rn5r/p1pk1p1p/1p2p1pb/3p1bP1/3PPB2/1P6/P1P1NP1P/1R1NKn1R b - - 0 18 ; Best move: f5e4
The current state of the chess board is: Black rook at a8, black knight at b8 and black rook at h8. Black pawn at a7, black pawn at c7, black king at d7, black pawn at f7 and black pawn at h7. Black pawn at b6, black pawn at e6, black pawn at g6 and black bishop at h6. Black pawn at d5, black bishop at f5 and white pawn at g5. White pawn at d4, white pawn at e4 and white bishop at f4. White pawn at b3. White pawn at a2, white pawn at c2, white knight at e2, white pawn at f2 and white pawn at h2. White rook at b1, white knight at d1, white king at e1, black knight at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 18. Black to move.