rn2k3/p2pppbN/b7/1p1QP3/4P1r1/N1p5/PPP2P1P/R1B2K1R w q - 2 18
FEN state: rn2k3/p2pppbN/b7/1p1QP3/4P1r1/N1p5/PPP2P1P/R1B2K1R w q - 2 18 ; Best move: b2b4
The current state of the chess board is: Black rook at a8, black knight at b8 and black king at e8. Black pawn at a7, black pawn at d7, black pawn at e7, black pawn at f7, black bishop at g7 and white knight at h7. Black bishop at a6. Black pawn at b5, white queen at d5 and white pawn at e5. White pawn at e4 and black rook at g4. White knight at a3 and black pawn at c3. White pawn at a2, white pawn at b2, white pawn at c2, white pawn at f2 and white pawn at h2. White rook at a1, white bishop at c1, white king at f1 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.