rn2kb2/1p1bp1p1/7r/pBp2p1p/3p1n2/1P1P1NPP/PqP1PK1R/RNB3Q1 b q - 3 18
FEN state: rn2kb2/1p1bp1p1/7r/pBp2p1p/3p1n2/1P1P1NPP/PqP1PK1R/RNB3Q1 b q - 3 18 ; Best move: b2a1
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8 and black bishop at f8. Black pawn at b7, black bishop at d7, black pawn at e7 and black pawn at g7. Black rook at h6. Black pawn at a5, white bishop at b5, black pawn at c5, black pawn at f5 and black pawn at h5. Black pawn at d4 and black knight at f4. White pawn at b3, white pawn at d3, white knight at f3, white pawn at g3 and white pawn at h3. White pawn at a2, black queen at b2, white pawn at c2, white pawn at e2, white king at f2 and white rook at h2. White rook at a1, white knight at b1, white bishop at c1 and white queen at g1. Black queenside is the only castle move available. Half move number is 3. Full move number is 18. Black to move.