(define "CaptureSurroundedPiece"
    (enclose 
        (from (last To)) 
        Orthogonal 
        (between 
            if:("IsEnemyAt" (between)) 
            (apply   
                (and
                    (trigger "CaptureMade" Next)
                    (remove (between)) 
                )
            ) 
        )
    )
)

(define "HasMadeACapture"
    (is Triggered "CaptureMade" Next)
)

//------------------------------------------------------------------------------

(game "Atari Go" 
    (players 2) 
    (equipment { 
        (board <Board> use:Vertex) 
        (piece "Marker" Each)
    })
    
    (rules 
        (play 
            (do
                (move Add
                    (to (sites Empty))
                    (then ("CaptureSurroundedPiece"))
                )
                ifAfterwards:("HasFreedom" Orthogonal)
            )
        )
        (end (if "HasMadeACapture" (result Mover Win)))
    )
)

//------------------------------------------------------------------------------

(option "Board Size" <Board> args:{ <size> }
    {
    (item "9x9"  <(square 9)>  "The game is played on a 9x9 board.") 
    (item "13x13" <(square 13)> "The game is played on a 13x13 board.") 
    (item "15x15" <(square 15)> "The game is played on a 15x15 board.") 
    (item "19x19" <(square 19)> "The game is played on a 19x19 board.")** 
})

//------------------------------------------------------------------------------

(metadata
    
    (info
        {
        (description "Atari Go is a simplified version of Go where the first person to capture a stone wins.")
        (rules "The rules are identical to Go, except the winning condition is to be the first to capture a stone.")
        (source "<a href=\"https://boardgamegeek.com/boardgame/188/go\" target=\"_blank\" class=\"style1\" style=\"color: #0000EE\" />BGG</a>")
        (id "440")
        (version "1.3.14")
        (classification "board/space/territory")
        (credit "Eric Piette")
        }
    )
    
    (graphics {
        (board Style Go)
        (player Colour P1 (colour Black))
        (player Colour P2 (colour White))
    })
    
    (ai 
        "Atari Go_ai"
    )
    
)