rn1qkbr1/1pp1pp1p/4b2n/3p2P1/p2P1KP1/7Q/PPP1P2P/RNB2BNR b q - 1 10
FEN state: rn1qkbr1/1pp1pp1p/4b2n/3p2P1/p2P1KP1/7Q/PPP1P2P/RNB2BNR b q - 1 10 ; Best move: e6g4
The current state of the chess board is: Black rook at a8, black knight at b8, black queen at d8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at b7, black pawn at c7, black pawn at e7, black pawn at f7 and black pawn at h7. Black bishop at e6 and black knight at h6. Black pawn at d5 and white pawn at g5. Black pawn at a4, white pawn at d4, white king at f4 and white pawn at g4. White queen at h3. White pawn at a2, white pawn at b2, white pawn at c2, white pawn at e2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1, white bishop at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 10. Black to move.