rnb1kbr1/3p4/6pB/1pp2n2/p1P1P3/N1KP2P1/PP3P1P/Rq3BNR b q - 0 18
FEN state: rnb1kbr1/3p4/6pB/1pp2n2/p1P1P3/N1KP2P1/PP3P1P/Rq3BNR b q - 0 18 ; Best move: b5b4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at d7. Black pawn at g6 and white bishop at h6. Black pawn at b5, black pawn at c5 and black knight at f5. Black pawn at a4, white pawn at c4 and white pawn at e4. White knight at a3, white king at c3, white pawn at d3 and white pawn at g3. White pawn at a2, white pawn at b2, white pawn at f2 and white pawn at h2. White rook at a1, black queen at b1, white bishop at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 18. Black to move.