On Mon, 2010-11-29 at 09:10 +0100, Joost 't Hart wrote: 
> On 11/29/2010 02:44 AM, Matthew Twomey wrote:
> 
> Hi,
> 
> Good that it works a bit more to your liking now!
> 
> <zip>
> 
> > I also did an analysis with Stockfish, and I am noticing one strange
> > behavior. In the annotation, it's showing a Mate-in-X that is one more
> > that it should be. For example, it's showing:
> >
> > #####
> > 46.Ke6+ +--
> > Stockfish 1.9.1 JA 64bit: 100:M4
> >
> > (46.Ne4 48:M4 46..Kc8 47.Bg3 Kd8 48.Nc5 Kc8 49.Ra8#)
> > #####
> >
> > So in the annotation, it's reporting this variation as "M4" but
> > shouldn't it be showing up as "M3"? When I look at the actual engine
> > window, it's showing "M3". It's doing this with all mate-in-x
> 
> I am not sure we are in sync here:
> 
> The line starting with 46.Ne4 is a mate in 4 moves, ending with 49.Ra8#
> I cannot see how that should be an M3.
> 
> As to the engine window, which position is on the board when it shows 
> M3? The position before or after 46.Ne4 has been played?
> 
> Cheers,
> Joost.

Joost,

The engine window shows M3 after 46.Ne4 has been played. I definitely
could be misinterpreting or misunderstand the exact nature of the
annotation, but it still appears inconsistent to me. Let me try to
elaborate. In the example above, I understand (correctly?) that the
first part of the annotation shows the evaluation of the move that was
actually made:

#####
46.Ke6+ +-- 
Stockfish 1.9.1 JA 64bit: 100:M4
#####

This indicates that *after* 46.Ke6+ the position evaluates to M4 (this
is confirmed via the engine window). Now the second part of evaluation:

#####
(46.Ne4 48:M4 46..Kc8 47.Bg3 Kd8 48.Nc5 Kc8 49.Ra8#)
#####

This is showing an evaluation of M4, but here it's showing the
evaluation *before* 46.Ne4. So in the first case, the evaluation is
based on the situation after move 46 for white, and in the second case
it's showing the evaluation before move 46 for white.

So it's possible that this is the intended behavior, but I'm just not
sure. What I though the annotation would tell me is the "score" of the
move I made, and the "score" of the suggested move. Please let me know
if you believe I'm simply misunderstanding.

Thanks,

-Matt





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