X-Git-Url: http://winboard.nl/cgi-bin?a=blobdiff_plain;f=engine-intf.html;h=8d5e700183b8bf6ae90f812ecb29b7cec4ce2035;hb=533db2c788306e35c3eaee2eba0ce4a115be4bf3;hp=1546cc8eff457942bea209cb846d439b5aa5a7cf;hpb=30ff596d02fea83b3f303273077eccdd02dc928c;p=xboard.git

diff --git a/engine-intf.html b/engine-intf.html
index 1546cc8..8d5e700 100644
--- a/engine-intf.html
+++ b/engine-intf.html
@@ -1799,11 +1799,31 @@ output should be in the following format:
 <tr><td>score</td><td>Integer giving current evaluation in centipawns.</td></tr>
 <tr><td>time</td><td>Current search time in centiseconds (ex:1028 = 10.28 seconds).</td></tr>
 <tr><td>nodes</td><td>Nodes searched.</td></tr>
+<tr><td>*selective depth</td><td>Maximium length of any branch in the current search.</td></tr>
+<tr><td>*speed</td><td>Nodes per second in last measured time interval.</td></tr>
+<tr><td>*</td><td>Reserved for future extensions.</td></tr>
+<tr><td>*tbhits</td><td>Number of tablebase probes made in the current search.</td></tr>
 <tr><td>pv</td><td>Freeform text giving current "best" line.
 You can continue the pv onto another line if you start each
 continuation line with at least four space characters.</td></tr>
 </table>
 
+<p class="version47">
+The items marked with * are optional.
+If any of these items is present, the <b>pv</b> field must be preceeded directly by a tab character;
+if no tab character preceeds the first non-integer token,
+the <b>pv</b> field will start at the first non-blank character after <b>nodes</b>.
+Otherwise it will start after the last tab that is not behind any non-integer token.
+Of all integers between <b>nodes</b> and <b>pv</b> the last one is intepreted as <b>tbhits</b>.
+Of any remaining ones the first is interpreted as <b>selective depth</b>,
+and a second as <b>speed</b>.
+More infos could be added to this in the future.
+Note that older interfaces might consider the optional infos to be part of the <b>pv</b> field,
+and display them exactly as sent.
+It is therefore encouraged that engines use tabs or spaces to format this optional info
+so that it will display nicely in (not too wide) columns.
+</p>
+
 <p>
 Example:
 </p>