+static int is_markable(game_params *params, pegrow pegs)
+{
+ int i, nset = 0, nrequired, ret = 0;
+ pegrow colcount = new_pegrow(params->ncolours);
+
+ nrequired = params->allow_blank ? 1 : params->npegs;
+
+ for (i = 0; i < params->npegs; i++) {
+ int c = pegs->pegs[i];
+ if (c > 0) {
+ colcount->pegs[c-1]++;
+ nset++;
+ }
+ }
+ if (nset < nrequired) goto done;
+
+ if (!params->allow_multiple) {
+ for (i = 0; i < params->ncolours; i++) {
+ if (colcount->pegs[i] > 1) goto done;
+ }
+ }
+ ret = 1;
+done:
+ free_pegrow(colcount);
+ return ret;
+}
+