r1b1k3/1pp1nrb1/p2p1p2/1Pq1p1pp/1QP1PP2/1n5P/P2K2PB/1RN2BNR w q - 2 18
FEN state: r1b1k3/1pp1nrb1/p2p1p2/1Pq1p1pp/1QP1PP2/1n5P/P2K2PB/1RN2BNR w q - 2 18 ; Best move: b4b3
The current state of the chess board is: Black rook at a8, black bishop at c8 and black king at e8. Black pawn at b7, black pawn at c7, black knight at e7, black rook at f7 and black bishop at g7. Black pawn at a6, black pawn at d6 and black pawn at f6. White pawn at b5, black queen at c5, black pawn at e5, black pawn at g5 and black pawn at h5. White queen at b4, white pawn at c4, white pawn at e4 and white pawn at f4. Black knight at b3 and white pawn at h3. White pawn at a2, white king at d2, white pawn at g2 and white bishop at h2. White rook at b1, white knight at c1, 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 2. Full move number is 18. White to move.