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Special case for pawns (2-cell movement)

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beyondlimits 2015-10-25 15:50:26 +01:00
parent 11bbeb1cec
commit bfc09c5008
1 changed files with 25 additions and 16 deletions
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41
init.lua
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@ -131,23 +131,20 @@ function realchess.move(pos, from_list, from_index, to_list, to_index, count, pl
if thisMove == "white" then
-- white pawns can go up only
if from_y - 1 ~= to_y then
return 0
end
-- if x not changed,
-- ensure that destination cell is empty
-- elseif x changed one unit left or right
-- ensure the pawn is killing opponent piece
-- else
-- move is not legal - abort
if from_x == to_x then
if pieceTo ~= "" then
if from_y - 1 == to_y then
if from_x == to_x then
if pieceTo ~= "" then
return 0
end
elseif from_x - 1 == to_x or from_x + 1 == to_x then
if not pieceTo:find("black") then
return 0
end
else
return 0
end
elseif from_x - 1 == to_x or from_x + 1 == to_x then
if not pieceTo:find("black") then
elseif from_y - 2 == to_y then
if pieceTo ~= "" or from_y < 6 or inv:get_stack(from_list, xy_to_index(from_x, from_y - 1)):get_name() ~= "" then
return 0
end
else
@ -155,7 +152,19 @@ function realchess.move(pos, from_list, from_index, to_list, to_index, count, pl
end
elseif thisMove == "black" then
-- black pawns can go down only
if from_y + 1 ~= to_y then
if from_y + 1 == to_y then
if from_x == to_x then
if pieceTo ~= "" then
return 0
end
elseif from_x - 1 == to_x or from_x + 1 == to_x then
return 0
end
elseif from_y + 2 == to_y then
if pieceTo ~= "" or from_y > 1 or inv:get_stack(from_list, xy_to_index(from_x, from_y + 1)):get_name() ~= "" then
return 0
end
else
return 0
end