rn1qk3/4np2/1p1r3p/1b2Q1p1/2ppPPP1/P1P4P/P2P4/RNBKNR2 w q - 4 18
FEN state: rn1qk3/4np2/1p1r3p/1b2Q1p1/2ppPPP1/P1P4P/P2P4/RNBKNR2 w q - 4 18 ; Best move: e5b5
The current state of the chess board is: Black rook at a8, black knight at b8, black queen at d8 and black king at e8. Black knight at e7 and black pawn at f7. Black pawn at b6, black rook at d6 and black pawn at h6. Black bishop at b5, white queen at e5 and black pawn at g5. Black pawn at c4, black pawn at d4, white pawn at e4, white pawn at f4 and white pawn at g4. White pawn at a3, white pawn at c3 and white pawn at h3. White pawn at a2 and white pawn at d2. White rook at a1, white knight at b1, white bishop at c1, white king at d1, white knight at e1 and white rook at f1. Black queenside is the only castle move available. Half move number is 4. Full move number is 18. White to move.