rnb1kbr1/ppq1n1p1/2p1p3/5p1p/P1pP3P/4P1P1/1P2KPB1/RNB1Q1NR w q - 4 10
FEN state: rnb1kbr1/ppq1n1p1/2p1p3/5p1p/P1pP3P/4P1P1/1P2KPB1/RNB1Q1NR w q - 4 10 ; Best move: g1f3
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at b7, black queen at c7, black knight at e7 and black pawn at g7. Black pawn at c6 and black pawn at e6. Black pawn at f5 and black pawn at h5. White pawn at a4, black pawn at c4, white pawn at d4 and white pawn at h4. White pawn at e3 and white pawn at g3. White pawn at b2, white king at e2, white pawn at f2 and white bishop at g2. White rook at a1, white knight at b1, white bishop at c1, white queen at e1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 4. Full move number is 10. White to move.