Address issue mentioned in Dave's comment

headers/slmake.h

@@ -531,14 +531,17 @@ namespace apg {
                                 pattern altstell = remainder + xlt.shift(bbox[0], bbox[1]);
                                 double altstelllength = stelllength;
                                 uint64_t altbdiff = 0;
+
+                                bool oneblock_improvement = false;
+
                                 if (oneblock) {
                                     int64_t bbox2[4] = {0};
                                     xlt.shift(bbox[0], bbox[1]).getrect(bbox2);
                                     bbox2[0] -= ideal[0];
                                     bbox2[1] -= ideal[1];
                                     altbdiff = (bbox2[0] * bbox2[0]) + (bbox2[1] * bbox2[1]);
-                                    trythis = (altbdiff == 0);
-                                    trythis = trythis || (std::sqrt((double) altbdiff) <= std::sqrt((double) bdiff) - 25.0);
+                                    oneblock_improvement = (std::sqrt((double) altbdiff) <= std::sqrt((double) bdiff) - 25.0 + 0.1 * initbail);
+                                    trythis = (altbdiff == 0) || oneblock_improvement;
                                 } else if (lexrepr == "xs4_33") {
                                     if (trycount == deep_bailout) {
                                         std::cout << "Reached bailout for strategy 'deep'" << std::endl;
@@ -588,7 +591,7 @@ namespace apg {
                                         if (altbdiff == 0) {
                                             std::cout << "\033[32;1mInitial block correctly emplaced\033[0m" << std::endl;
                                             return newpat;
-                                        } else if (std::sqrt((double) altbdiff) <= std::sqrt((double) bdiff) - 25.0) {
+                                        } else if (oneblock_improvement) {
                                             std::cout << "\033[32;1mInitial block moved towards target\033[0m" << std::endl;
                                             return newpat;
                                         }