$B%*%j%8%J%k$N(B Trailers $B$O(B Roll $B$G$-$^$;$s!%(B Single Checkmate $B$O(B
Checkmate The Column [A2] $B$N(B Single $B$N%P!<%8%g%s$G$9!%(B
Checkmate The Column $B$K$D$$$F$b(B, Trailing two $B$O:G8e$N%Q!<%H$,(B Step Ahead $B$J$N$G(B, Roll $B$G$-$^$;$s!%(B
Single Checkmate $B$O(B $BNr;KE*$K(B, each side $B$G9T$&$H$-$O(B Split Checkmate $B$H%3!<%k$5$l(B, center $B$"$k$$$O(B box $B$G9T$&$H$-$O(B Box Checkmate $B$H%3!<%k$5$l$F$-$^$7$?!%(B
Cheat: Box Counter Rotate 1/4 $B$r$7$F(B, Box Circulate $B$G$9!%(B
$B$3$N(B cheat $B$O(B, $B%*%j%8%J%k$N(B Leaders $B$@$1$,(B Roll $B$G$-$k$H$$$&$3$H$r$O$C$-$j$5$;$^$9!%B>$N;qNA$K$O(B, $BF1$8$h$&$J(B cheat (Box Circulate; Box Counter Rotate 1/4) $B$,$"$j$^$9$,(B, $B$=$l$G$OA40w$,(B Roll $B$G$-$k$h$&$K;W$($F$7$^$$$^$9!%(B
Checkmate The Column [A2] (H.P. Williams 1975):
Column $B$+$i!%(B
$B;O$a$N(B 2 $B?M$O(B Circulate 4 spots $B$r$7(B 1/4 In $B$r(B, $B8e$N(B2$B?M$O(B Circulate twice - 1/4 In - Circulate $B$r$7$^$9!%(B
$BIaDL$N(B Column $B$+$i$O(B, $BJ?9T$J(B Two-Faced Line $B$G=*$o$j$^$9!%(B
$BSingle CONCEPT [C3A,C3B,C4].