diff --git a/src/main/fragment/mos6502-common/vwsz1_lt_pwsc1_derefidx_vbuyy_then_la1.asm b/src/main/fragment/mos6502-common/vwsz1_lt_pwsc1_derefidx_vbuyy_then_la1.asm
new file mode 100644
index 000000000..021d3e038
--- /dev/null
+++ b/src/main/fragment/mos6502-common/vwsz1_lt_pwsc1_derefidx_vbuyy_then_la1.asm
@@ -0,0 +1,8 @@
+lda {z1}
+cmp {c1},y
+lda {z1}+1
+sbc {c1}+1,y
+bvc !+
+eor #$80
+!:
+bmi {la1}
\ No newline at end of file