The generator matrix

 1  0  0  0  0  0  1  1  1  0  1  1  1  1  1  X  1  0
 0  1  0  0  0  0  0  0  0  0  1  X  1  1 X+1  1  1  1
 0  0  1  0  0  0  0  0  0  0  1 X+1 X+1  X  X  0  1 X+1
 0  0  0  1  0  0  0  1  1  1  0  1 X+1 X+1  1 X+1  0  1
 0  0  0  0  1  0  1  1  0  1  0  0 X+1  1  X X+1  1  X
 0  0  0  0  0  1  1  0  1  1  X  0  0  1  0  X X+1  0
 0  0  0  0  0  0  X  0  0  X  X  X  X  X  X  X  0  0
 0  0  0  0  0  0  0  X  0  X  X  0  0  0  X  X  0  0
 0  0  0  0  0  0  0  0  X  X  X  X  0  X  X  0  X  X

generates a code of length 18 over Z2[X]/(X^2) who´s minimum homogenous weight is 10.

Homogenous weight enumerator: w(x)=1x^0+258x^10+1366x^12+3384x^14+6825x^16+9100x^18+6825x^20+3384x^22+1366x^24+258x^26+1x^36

The gray image is a linear code over GF(2) with n=36, k=15 and d=10.
As d=10 is an upper bound for linear (36,15,2)-codes, this code is optimal over Z2[X]/(X^2) for dimension 15.
This code was found by Heurico 1.16 in 18.7 seconds.