r1bqkb2/pppp1p2/n7/4Nnp1/4r2p/PPP1P3/3BBPPP/RN1Q1RK1 w q - 0 13
FEN state: r1bqkb2/pppp1p2/n7/4Nnp1/4r2p/PPP1P3/3BBPPP/RN1Q1RK1 w q - 0 13 ; Best move: e5g4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8 and black bishop at f8. Black pawn at a7, black pawn at b7, black pawn at c7, black pawn at d7 and black pawn at f7. Black knight at a6. White knight at e5, black knight at f5 and black pawn at g5. Black rook at e4 and black pawn at h4. White pawn at a3, white pawn at b3, white pawn at c3 and white pawn at e3. White bishop at d2, white bishop at e2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at a1, white knight at b1, white queen at d1, white rook at f1 and white king at g1. Black queenside is the only castle move available. Half move number is 0. Full move number is 13. White to move.