{"history": [{"pid": 0, "action": "check", "amount": null}]}
{"history": [{"pid": 0, "action": "check", "amount": null}, {"pid": 1, "action": "bet", "amount": 10}]}
{"history": [{"pid": 0, "action": "check", "amount": null}]}
{"history": [{"pid": 0, "action": "check", "amount": null}, {"pid": 1, "action": "bet", "amount": 10}]}