rnb2br1/p2pk1p1/3Np3/1pp1Bp1n/2P4p/P2P4/QPK1PPPP/R4BNR w - - 0 18
FEN state: rnb2br1/p2pk1p1/3Np3/1pp1Bp1n/2P4p/P2P4/QPK1PPPP/R4BNR w - - 0 18 ; Best move: c4b5
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at d7, black king at e7 and black pawn at g7. White knight at d6 and black pawn at e6. Black pawn at b5, black pawn at c5, white bishop at e5, black pawn at f5 and black knight at h5. White pawn at c4 and black pawn at h4. White pawn at a3 and white pawn at d3. White queen at a2, white pawn at b2, white king at c2, white pawn at e2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at a1, white bishop at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 18. White to move.