Multi PV analysis

Live analysis of a position using go infinite with MultiPV, parsing the engine's info lines as they arrive to show the best few lines. Enter a FEN or pick an example. Note that stop (and changing position or MultiPV) can take a while to respond at higher depths, because Lozza only checks for stop between iterative deepening iterations, and with MultiPV each iteration searches several lines.

#depthscoreline
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