r1b2rk1/p2p2pn/npqb3p/1Pp1P3/Q1P1p1P1/P4N2/3P1KBP/RNB4R w - - 4 18
FEN state: r1b2rk1/p2p2pn/npqb3p/1Pp1P3/Q1P1p1P1/P4N2/3P1KBP/RNB4R w - - 4 18 ; Best move: b5c6
The current state of the chess board is: Black rook at a8, black bishop at c8, black rook at f8 and black king at g8. Black pawn at a7, black pawn at d7, black pawn at g7 and black knight at h7. Black knight at a6, black pawn at b6, black queen at c6, black bishop at d6 and black pawn at h6. White pawn at b5, black pawn at c5 and white pawn at e5. White queen at a4, white pawn at c4, black pawn at e4 and white pawn at g4. White pawn at a3 and white knight at f3. White pawn at d2, white king at f2, white bishop at g2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1 and white rook at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 18. White to move.