this is about book depth, max number of moves (move limit), 50 move rule

this has very deep analyses and in-depth info

about the tourney settings

and engine parameters

and the mechnism behind engine matches

***

book depth: 16

the book depth I use is 16

ppl usually use like 12

and 16 is like 4 more than 12

but I found out 16 is okay

depth of 16 proved to be very good

I have watched hundreds of matches and perhaps 1000 matches

with this setting of 16

the result should be somewhat different from book to book

if we run 100 matches with book depth of 16

from my observation

85 matches on average are perfectly started

that is approx. 85 matches will have eval of 0.3 or less

as soon as the book is no longer used

(= from the move number 17)

so that score of 0.3 or less is natural

and no one side is penalized heavily from the get-go

by having evals like -0.8 or something like that from the move number 17

for the rest 15 matches

the eval diff is something like a little more than 0.3

mostly slightly more than 0.3

so that's quite reasonably okay

***

50 move rule: 16 move rule

when using 50 move rule

the matches usually have a long winded movements back and forth

without certain purpose

both sides usually just move around pieces back and forth

hither and thither without certain goal to earn more time

and the length of the matches will be very long

I have observed and watched carefully for more than hundreds of matches (perhaps 1000)

with this 16 move rule setting

16 move rule is working like a magic

if I may use the figurative speech

or to simply put

16 move rule is working well almost without salient flaws or errors

and it is working very well from my observation

*

as I mentioned above

the book depth of 16 is working 100% perfect for 85 out of 100

and the depth of 16 is working reasonably acceptably well for 15 out of 100

so let's extrapolate the score of the setting

85 * 1.0 + 15 * 0.5 = 85 + 7.5 = 92.5

the usage of book depth of 16 has the score of 92.5%

which is like A and just below A+ score

*

and as for this 16 move rule

this 16 move rule setting is also working well

from my observation

for 100 matches I have carefully obversed

about 94 matches were intact and perfect

with using 16 move rule

but for other 6 matches

the result was interfered

that is the match result could have been a win

but it results in a draw cuz of this 16 move rule

for example,

if white was leading with +3.0 score

at the ending phase

but the board position then is a zugzwang or a bottleneck

so even if white was leading with 3 points

after 16 moves

the match became a draw from the automatic GUI adjudication

if white had 34 more moves (hence total of 50 moves to go)

white could have solved the bottleneck or zugzwang situtaion

there is a chance that white can't solve the bottleneck or zugzwang

even after 50 moves

but, there also is a chance that white can solve the bottleneck or zugzwang

before the 50 moves

it is half and half

so for 6 matches of 100

about half of the match result became draw

when the actual result should have been a win

so 3 matches were interfered

and other 3 matches were intact

and as for the remaining 94 matches

the match result was perfect and intact

from my observation

so no problem there

so let's postulate the score of this 16 move rule setting

94 matches = 100% = 94 * 1.0 = 94%

6 matches = 3 is 100%, 3 is 0% = total is 3%

so the holistic overall score is 94% + 3% = 97%

and that is a sure A+ score

***

maximum number of moves: 120

the maximum number of moves is 120

many ppl will think 120 is way short

there will be so many matches which go over 120 moves!

at the first glance

it seems like that

but keep in mind that we have the 16 move rule in place

16 move rule and 120 rule work in tendum and cooperation with each other

perfectly well in harmony

engines have contempt and contemptscore parameters

and this is the most important aspect when it comes to this topic

*

let's say if we have the standard 50 move rule

and max of 200 rule

which are generally used

we need 200 rule cuz we have 50 move rule

to elaborate more

cuz we are usually using 50 move rule

the engines will make back and forth,

hither and thither moves without certant and overt purposes

a lot for a long period

that's why when we use 50 move rule

engines make a lot of those

so-called "back and forth hither and thither moves without any certain overta purpose"

(by the way, does any one know the proper name or terminology for this?)

let's just shorten that name until we come up with other better names

let's just use "back and forth moves"

when we use 50 move rule

engines make so many back and forth moves

that's why we need max of 200 rule

but if we use 16 move rule

then engines don't make such back and forth moves a lot

since the engines can calculate usually over 16 moves

if they make such back and forth moves

the engines know that they will have a draw

and this is something the engines don't like

having a draw is something the engines don't like

so the engines will not try to do the back and forth moves

*

having a draw is something the engines don't like

and this is a very important statement

and there is more to than meets the eye

if black is losing and white is winning

black wants a draw

so black will make lots of back and forth moves

but white will not let it happen

white will not do back and forth moves

white will be the one which doesn't do back and forth moves

cuz this statement

having a draw is something the engines don't like

holds true 100% all the time

when the match is even and balanced out

(= when the eval is close to 0.0

and not in favor of any one particular side)

both engines don't want to draw)

there are 2 engines which don't do back and forth moves

when the match is not even

that is one side is winning

and another side is losing

the losing side is playing for a draw (it wants a draw)

so the losing side will do back and forth moves a lot

but the winning side will never do the back and forth moves

since the winning side doesn't want a draw

so when the match is not even

there is at least one side

that doesn't want a draw

so in any case (among the two possible senarios)

the statement

having a draw is something the engines don't like

holds true 100% all the time

and works perfectly well without any error or flaw

*

in conclusion,

cuz this statement

having a draw is something the engines don't like

holds true all the time

16 move rule and 120 rule work in tendum and cooperation with each other

perfectly well in harmony

so cuz we have 16 move rule

the engines rarely make the so-called

back and forth moves

so we don't need max of 200 rule

max of 120 rule is sufficient most of the time

max of 120 rule is more than enough most of the time

from my observation of watching hundreds or perhaps 1000 matches

with these settings

if we run 100 matches with max of 120 rule (along with 16 move rule)

almost all 100 matches don't go over 120 move limit

there are only a few matches that go over that 120 move restriction

but those are only a few

and when we run like 300 matches for one engine

that (a few matches exceeding 120) doesn't make any visible difference in elo ratings

but here is a catch

this is another point

a few matches among 100 matches will go over 120 move limit

but those a few matches are almost always drawish anyway

so even if there is no max move limit at all

those long and prolonged matches will be mostly draws anyway

usually only those matches which are quite even and in a bottleneck

will reach 120 move limit

*

so when we surmise the score of this maximum number of moves being 120

almost all the time, the matches end before 120 moves

= 100% score

only for some rare exceptions (a few matches per 100 matches)

the matches go over 120 limit

but most of these are drawish

and draws anyway

= almost 100% score

we merge the two aforementioned factors

and we get 99% or so

the overall score is 99%

***

book depth of 16 has the score of 92.5%

16 move rule is used

instead of 50 move rule

and the 16 move rule's score is 97%

the score for

maximum number of moves: 120 is 99%

***

as a result of the combination of all these settings

we can have a match faster

the total length of match on average is reduced by about 30%

and the total time needed to run a tourney with hundreds of matches is decreased by also 30%

while the accuracy of elo ratings is almost intact and perfect

so if we needed 10 hours to finish a tourney

now we only need 7 hours

and that's something important