Ruby implementation of a simple 8 queens solver

eightqueens.rb

def checkSquare(c,r,b)

    for i in b[c] do
        if i == 1
            return false
        end
    end
    
    for i in b do
        if i[r] == 1
            return false
        end
    end
    
    r2 = r
    c2 = c
    while r2 >=0 && c2 >= 0 do
        if b[c2][r2] == 1
            return false
        end
        r2-=1
        c2-=1
    end
    
    r2 = r
    c2 = c
    while r2 <= 7 && c2 >= 0 do
        if b[c2][r2] == 1
            return false
        end
        r2+=1
        c2-=1
    end
    
    r2 = r
    c2 = c
    while r2 >= 0 && c2 <= 7 do
        if b[c2][r2] == 1
            return false
        end
        r2-=1
        c2+=1
    end
    
    r2 = r
    c2 = c
    while r2 <= 7 && c2 <= 7 do
        if b[c2][r2] == 1
            return false
        end
        r2+=1
        c2+=1
    end
    
    return true
    
end

def cloneBoard(b)
    b2 = Array.new(8)
    for i in 0..7
        b2[i] = b[i].clone()
    end
    return b2
end

#create a new array of 8 & pass a codeblock to populate it with new arrays
b = Array.new(8) { |i| Array.new(8, 0) }

c = 0
r = 0

s = Array.new()

while c >= 0 do
    if checkSquare(c,r,b) then
        b[c][r] = 1
        
        if c < 7 then
            c+=1
            r=0
        else
            s.push(cloneBoard(b))
            b[c][r] = 0
            begin
                c-=1
                if c<0 then 
                    break
                end
                r = b[c].index(1)
                b[c][r] = 0
                r+=1
            end while r>7
        end
    else
        if r < 7 then
            r+=1 # try next row
        else
            #move back a column
            begin
                c-=1
                if c<0 then 
                    break
                end
                r = b[c].index(1)
                b[c][r] = 0
                r+=1
            end while r>7
        end
    end
end

for i in s
    for c in i
        for r in c
            print r
        end
        puts()
    end
    puts('------------------')
end

puts("Total of #{s.length} solutions found")