diff --git a/datokenizer.go b/datokenizer.go
index a213b33..3e01396 100644
--- a/datokenizer.go
+++ b/datokenizer.go
@@ -30,6 +30,7 @@
 	"encoding/binary"
 	"fmt"
 	"io"
+	"math"
 	"os"
 	"sort"
 	"strconv"
@@ -573,6 +574,7 @@
 
 		// Set base to the first free slot in the double array
 		base = dat.xCheck(A)
+		// base = dat.xCheckSkip(A)
 		// base = dat.xCheckNiu(A, &block_begin_pos)
 		dat.array[t].setBase(base)
 
@@ -771,6 +773,25 @@
 	return base
 }
 
+// This is an implementation of xCheck with the skip-improvement
+// proposed by Morita et al. (2001)
+func (dat *DaTokenizer) xCheckSkip(symbols []int) uint32 {
+
+	// Start at the first entry of the double array list
+	base := uint32(math.Abs(float64(dat.maxSize-1) * .9))
+
+OVERLAP:
+	// Resize the array if necessary
+	dat.resize(int(base) + dat.final)
+	for _, a := range symbols {
+		if dat.array[int(base)+a].getCheck() != 0 {
+			base++
+			goto OVERLAP
+		}
+	}
+	return base
+}
+
 // This is an implementation of xCheck wit an improvement
 // proposed by Niu et al. (2013)
 func (dat *DaTokenizer) xCheckNiu(symbols []int, block_begin_pos *uint32) uint32 {
diff --git a/datokenizer_test.go b/datokenizer_test.go
index c6b6c8e..62df4c7 100644
--- a/datokenizer_test.go
+++ b/datokenizer_test.go
@@ -983,3 +983,7 @@
 //   BenchmarkTransduce-4                       39966             30835 ns/op            8240 B/op          3 allocs/op
 //   BenchmarkToDoubleArray-4                   50720             24863 ns/op           11091 B/op         46 allocs/op
 //   BenchmarkToDoubleArrayLarger-4                 3         432523828 ns/op         6413381 B/op       5122 allocs/op
+// 2021-09-02 - xCheckSkip() with .9
+//   BenchmarkTransduce-4                       36325             38501 ns/op            8240 B/op          3 allocs/op
+//   BenchmarkToDoubleArray-4                   66858             19286 ns/op           10607 B/op         29 allocs/op
+//   BenchmarkToDoubleArrayLarger-4                18          67428011 ns/op         6360604 B/op       2578 allocs/op