Update the explanation for what a 1.00 score is.

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 <h2 style="clear: both;">Symbol explanation</h2>
 <ul>
-  <li><strong>Score:</strong> 1.00 is the value of one pawn (in a balanced endgame). Positive values are better for white.</li>
+  <li><strong>Score:</strong> 1.00 is roughly one pawn
+   (<a href="https://github.com/official-stockfish/Stockfish/commit/ad2aa8c06f438de8b8bb7b7c8726430e3f2a5685">technically</a>,
+   50% win probability for a computer). Positive values are better for white.</li>
   <li><strong>PV:</strong> Principal Variation, the series of moves the engine thinks is the best.</li>
   <li><strong>Thick red line:</strong> Marks the best move (in the view of the engine). Multiple chained arrows
     means that the PV starts with multiple successive moves with the same piece, ie., the engine thinks