I call and let him hang himself on a non spade river.

Too obvious?

I think a push lets him get away too easily with an overpair, and any decent raise is the same as a push.

4th spade comes on the river, I call a reasonable bet but fold to a push.

No spade comes, I push....hopefully he puts a little more money in and doesn't check.

His turn bet looks like a tester.....

I am trying to get acclimated to $100 so if this is really bad let me know...