r1b3r1/ppk2p2/1qnpp3/1Qp5/2P4p/P3K2P/P2P1PP1/RNB1NB1R w - - 4 18
FEN state: r1b3r1/ppk2p2/1qnpp3/1Qp5/2P4p/P3K2P/P2P1PP1/RNB1NB1R w - - 4 18 ; Best move: b5b6
The current state of the chess board is: Black rook at a8, black bishop at c8 and black rook at g8. Black pawn at a7, black pawn at b7, black king at c7 and black pawn at f7. Black queen at b6, black knight at c6, black pawn at d6 and black pawn at e6. White queen at b5 and black pawn at c5. White pawn at c4 and black pawn at h4. White pawn at a3, white king at e3 and white pawn at h3. White pawn at a2, white pawn at d2, white pawn at f2 and white pawn at g2. White rook at a1, white knight at b1, white bishop at c1, white knight at e1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 18. White to move.