chkc – bt 31cxd1, chkc – bt 31cxd2, chkc – bt 31cxd5,
chkc – bt 32cxd1, chkc – bt 32cxd2, chkc – bt 32cxd3, chkc – bt 32cxd4, chkc – bt 32cxd5
chkc – bt 33cxd1, chkc – bt 33cxd2, chkc-bt 33cxd3, chkc-bt 33cxd4, chkc – bt 33cxd5, chkc – bt 33cxd6, chkc – bt 33cxd7
