A problem with a single bolt latch is that it becomes a pivot point as a would-be-escappee tries to butt under or lean on the gate above the latch. I've solved that problem by installing two of these http://www.farmandfleet.com/products/596614-hillman-gate-latch.html Put the upper one in a position easily reached by you over the gate when inside and connect the two latch levers with a loose fitting string. A tug on the string will release both latches simultaneously.
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