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That isn't a matter of the programming so much as the underlying algorithm itself acting correctly according to the definition of winning or losing at go. A simple consequence of "margin of victory irrelevant; a win by one point is as good as a win by 20". The exact same situation applies to a "match" sailboat race (a race between two boats, like the finals of the "America's Cup") If you are ahead, the proper strategy is to keep your boat between the opponent and the next mark as this guarantees remaining ahead no matter how the wind might shift. If you are behind, proper strategy is to veer to one side or the other of the direct course. If the boat ahead does not "cover" (what I said before) this gives some chance of pulling the race out if there is a favorable wind shift at the negligible price of losing by a larger margin if the wind doesn't shift or shifts the other way.

You didn't mention the converse behavior. If behind, the MCTS algorithm will play more and more risky moves until they become so hopelessly risky the game is getting worse and worse and eventually the program resigns when calculation gives no chance at all (or below the chance that triggers "resignation"). The same thing tends to happen in the sailboat race. Each time the boat behind veers the boat ahead in "covering" can usually cut the corner somewhat and so be increasing its lead (it doesn't have to veer quite as much as the boat behind did to stay between the boat behind and the next mark).

you seem to be winning pretty easily, perhaps you should lower the handicap for a more interesting match?

Er... the poster played white.

Edit: Apparently I misread the names. Reading mistakes can happen any time people, not just when you're playing.

Sandbagger! (Apparently, they do exist.)

It is a bit ridiculous to place 4 handicap on 13x13 against an opponent only 3 stones stronger (on 19x19). Play appropriate handicap, please, and show us the games. Thanks for listening.

@skydyr: No, the poster did not play white.

Black doesn't seem like a sandbagger to me, the play in the first game is substantially weaker than the claimed 2 dan (moves 8, 10, 12, 14, 16 for example), but with 4 stones handicap you can get away with almost anything so long as you don't kill yourself too much.