No placing on squares with a +:
V3;1q;1q;{(0(Zu)c)04(1p(1m)}}2(1p(1k)c{{}}}(2P(1p)(1p(1m)0c}c}2(1p(1k)oc}c0(1p(1l){ceco(5t(1n)(9x(1p)(0(!-);;
V3;1q;1q;{(0(Zu)c)04(1p(1m)}}2(1p(1k)c6W}}}(2P(1l)Uc(1p(1o)0c}c}2(1p(1k)oc}c0(1p(1l){ceco(87(1n)(9x(1p)(0(!-);;
ez
V3;1q;1q;{(0(Zu)c)04(1p(1m)}}2(1p(1k)c{Y}}}(2P(1p)(1p(1m)0c}c}2(1p(1k)oc}c0(1p(1l){ceco(5t(1n)(9x(1p)(0(!-);;;0