For situations like these, using the 'like' argument to the <mt:if> tag, in combination with some attributes of the <mt:var> tag can come in very handy. Consider this code snippet:
<mt:var name="matches" value="0">
<mt:entries lastn="9999">
<mt:setvarblock name="thecounter"><mt:var name="__counter__"></mt:setvarblock>
<mt:if tag="entrytitle" like="Movable"><mt:var name="matches" op="+" value="1" setvar="matches"></mt:if>
</mt:entries>
Total number of entries: <mt:var name="thecounter"><br>
Number of enties with the word 'Movable' in the title: <mt:var name="matches">
Let's go over it line by line. The first line sets the variable $matches to zero. Then we loop over the past 9999 entries and we stick the value of the system variable __counter__ in a temporary variable named $thecounter each time we go through the loop. This variable tells us where in the loop we are. (This could be optimized further by only doing this the last time we go through the loop, but for the sake of simplicity it is not done here)
As soon as we find an entry where the title matches the string 'Movable' we add 1 to the value of the $matches and put the resulting value back into the $matches variable.
At the end, we display our results, which for this blog would look like this right now:
Total number of entries: 16
Number of enties with the word 'Movable' in the title: 10
Number of enties with the word 'Movable' in the title: 10
(And after this particular entry has been published, it will be 11)
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