diff -r e284e3ad2800 -r 955d3add9426 takuzu.go
--- a/takuzu.go	Sun Oct 16 09:48:36 2016 +0200
+++ b/takuzu.go	Sun Oct 16 10:08:11 2016 +0200
@@ -256,73 +256,6 @@
 	}
 }
 
-// CheckLine returns an error if the line i fails validation
-func (b Takuzu) CheckLine(i int) error {
-	_, err := checkRange(b.GetLine(i))
-	return err
-}
-
-// CheckColumn returns an error if the column i fails validation
-func (b Takuzu) CheckColumn(i int) error {
-	_, err := checkRange(b.GetColumn(i))
-	return err
-}
-
-// Validate checks a whole board for errors (not completeness)
-// Returns true if all cells are defined.
-func (b Takuzu) Validate() (bool, error) {
-	finished := true
-
-	computeVal := func(cells []Cell) (val int) {
-		for i := 0; i < len(cells); i++ {
-			val += cells[i].Value * 1 << uint(i)
-		}
-		return
-	}
-
-	lineVals := make(map[int]bool)
-	colVals := make(map[int]bool)
-
-	for i := 0; i < b.Size; i++ {
-		var d []Cell
-		var full bool
-		var err error
-
-		// Let's check line i
-		d = b.GetLine(i)
-		full, err = checkRange(d)
-		if err != nil {
-			return false, errors.Wrapf(err, "line %d", i)
-		}
-		if full {
-			hv := computeVal(d)
-			if lineVals[hv] {
-				return false, fmt.Errorf("duplicate lines (%d)", i)
-			}
-			lineVals[hv] = true
-		} else {
-			finished = false
-		}
-
-		// Let's check column i
-		d = b.GetColumn(i)
-		full, err = checkRange(d)
-		if err != nil {
-			return false, errors.Wrapf(err, "column %d", i)
-		}
-		if full {
-			hv := computeVal(d)
-			if colVals[hv] {
-				return false, fmt.Errorf("duplicate columns (%d)", i)
-			}
-			colVals[hv] = true
-		} else {
-			finished = false
-		}
-	}
-	return finished, nil
-}
-
 func dumpRange(cells []Cell) {
 	for _, c := range cells {
 		if !c.Defined {
@@ -333,62 +266,3 @@
 	}
 	fmt.Println()
 }
-
-// checkRange returns true if the range is completely defined, and an error
-// if it doesn't follow the rules for a takuzu line or column
-// Note that the boolean might be invalid if the error is not nil.
-func checkRange(cells []Cell) (bool, error) {
-	full := true
-	size := len(cells)
-	counters := []int{0, 0}
-
-	var prevCell Cell
-	var prevCellCount int
-
-	for _, c := range cells {
-		if !c.Defined {
-			full = false
-			prevCell.Defined = false
-			prevCellCount = 0
-			continue
-		}
-		counters[c.Value]++
-		if prevCellCount == 0 {
-			prevCellCount = 1
-		} else {
-			if c.Value == prevCell.Value {
-				prevCellCount++
-				if prevCellCount > 2 {
-					return full, errors.Errorf("3+ same values %d", c.Value)
-				}
-			} else {
-				prevCellCount = 1
-			}
-
-		}
-		prevCell = c
-	}
-	if counters[0] > size/2 {
-		return full, errors.Errorf("too many zeroes")
-	}
-	if counters[1] > size/2 {
-		return full, errors.Errorf("too many ones")
-	}
-	return full, nil
-}
-
-// CheckRangeCounts returns true if all cells of the provided range are defined,
-// as well as the number of 0s and the number of 1s in the range.
-func CheckRangeCounts(cells []Cell) (full bool, n0, n1 int) {
-	counters := []int{0, 0}
-	full = true
-
-	for _, c := range cells {
-		if c.Defined {
-			counters[c.Value]++
-		} else {
-			full = false
-		}
-	}
-	return full, counters[0], counters[1]
-}