After unsuccessfully trying to make Pairs, an AGA Amiga solitaire game, work under Windows using WinUAE, I went looking for native alternatives. I found out this particular variant of Mahjong is called Shisen-Sho. From the Shisen-Sho games listed on Vegard Krog Petersen’s site I tried a few and found the best two for my liking were Shisen-Sho by iBinx (which is free) and Shisen for Java.