rn1q1knr/3b1p2/1ppp4/p6P/PPP1p2P/R3P1P1/1B2P3/1N1QKBNR b - - 0 18
FEN state: rn1q1knr/3b1p2/1ppp4/p6P/PPP1p2P/R3P1P1/1B2P3/1N1QKBNR b - - 0 18 ; Best move: a5b4
The current state of the chess board is: Black rook at a8, black knight at b8, black queen at d8, black king at f8, black knight at g8 and black rook at h8. Black bishop at d7 and black pawn at f7. Black pawn at b6, black pawn at c6 and black pawn at d6. Black pawn at a5 and white pawn at h5. White pawn at a4, white pawn at b4, white pawn at c4, black pawn at e4 and white pawn at h4. White rook at a3, white pawn at e3 and white pawn at g3. White bishop at b2 and white pawn at e2. White knight at b1, white queen at d1, white king at e1, white bishop at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 18. Black to move.