m = 0
    boo = True
    for i in range(H):
        if Test(mur,piece,i,col) == -2:
            m += 1
    if m == H: return -1
    i = 0
    while boo == True:
        boo = boo and Test(mur,piece,i,col) == -2
        i += 1
    if Test(mur,piece,i,col) == -1: return -1
    boo = False
    while Test(mur,piece,i,col) == 0 :
        i+=1
    return i-1