test: Refactor move tests with subtests and simpler handling

Simplify error handling and improve test structure in move_test.go

- Remove `defer` and `recover` block, streamlining error handling.
- Refactor `t.Log` calls into subtests using `t.Run` for better granularity.
- Organize tests into isolated subtests for clearer execution and reporting.

[board/move_test.go]
- Removed the `defer` and `recover` block for error recovery, simplifying error handling.
- Changed the `t.Log` for each ply into a subtest using `t.Run`.
- Improved test structure by adding isolated subtests for each ply using `t.Run`, providing better granularity for test execution and reporting.

board/move_test.go

@@ -95,17 +95,12 @@ func TestPerfs(t *testing.T) {
 			}
 
 			for ply := 1; ply <= len(test.knownPerfs); ply++ {
-				t.Log(strconv.Itoa(ply))
-				defer func() {
-					err := recover()
-					if err != nil {
-						t.Error(err)
+				t.Run(strconv.Itoa(ply), func(t *testing.T) {
+					calculated := start.Perft(ply)
+					if calculated != test.knownPerfs[ply-1] {
+						t.Fatalf("expected %v nodes, got %v", test.knownPerfs[ply-1], calculated)
 					}
-				}()
-				calculated := start.Perft(ply)
-				if calculated != test.knownPerfs[ply-1] {
-					t.Fatalf("expected %v nodes, got %v", test.knownPerfs[ply-1], calculated)
-				}
+				})
 			}
 		})
 	}