1rq1kbnr/p1p1pp2/1pnp2B1/1P5p/2P2Pp1/NQ2P2b/P2PK1PP/R1BR4 w k - 0 20
FEN state: 1rq1kbnr/p1p1pp2/1pnp2B1/1P5p/2P2Pp1/NQ2P2b/P2PK1PP/R1BR4 w k - 0 20 ; Best move: g6e4
The current state of the chess board is: Black rook at b8, black queen at c8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at a7, black pawn at c7, black pawn at e7 and black pawn at f7. Black pawn at b6, black knight at c6, black pawn at d6 and white bishop at g6. White pawn at b5 and black pawn at h5. White pawn at c4, white pawn at f4 and black pawn at g4. White knight at a3, white queen at b3, white pawn at e3 and black bishop at h3. White pawn at a2, white pawn at d2, white king at e2, white pawn at g2 and white pawn at h2. White rook at a1, white bishop at c1 and white rook at d1. Black kingside is the only castle move available. Half move number is 0. Full move number is 20. White to move.