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3. Januar 2009, 14:25:49
Constellation36 
Being a very experienced player of Fevga i took a moment to see a game.
It is the Rabbitoid - Alexlee.

I noticed some very very serious mistakes there. And i guess this happens for most Fevga games here. I guess this is definitely logical since it's a new game on Brainking and most players are inexperienced to Fevga.

Anyway i tried to analyze it a bit:
________________________________________________________________
1.pass 13-15, 15-20

2. 1-6, 6-8
2...20-24 In Greece our rules say that we are allowed to use the smaller roll of the dice only if we want too and only in the early opening phase(where you have to place a checker in the opponent's board) only, e.g we can play 20-21. I guess Brainking system implements Backgammon rules so you can only play the "4" of the roll and not only the "1".
BTW the notation of the board sucks big time. How can you call this 20-24 move while the Brainking's game's board says different things?

3. 8-9, 9-14 24-4, 13-16

4. 1-5, 1-3? A beginner's mistake. Fear about covering his board, but wrongly. How black can threat it? The nearest checkers is far away and even if it had 2-3 in close range again it will be wrong play. The correct play is to cover the !very! important 5 point of the opponent's board(the 18 point in the notation) and play 14-18! 1-3.
People don't realize how important is the 5 point in your opponent's home. The 18-point in the notation of Brainking.
It's probably the strongest point of the game generally. Another very strong point is the next one to the 18, the 19.
If you control these opponent struggles in most cases. So a player must try to control his 5 and 6 point before his opponent goes there.
And the other thing is that even good players at Fevga overestimate their home board and try to close it and make 5 -primes there(you are not allowed to make a full 6 prime there). We don't need this. This is wrong! Generally. We only need 3-4 blots there and it's OK. What we need is to advance. In the opening don't try to put as many checkers on your home board, but advance! Run your checkers to opponent's home and to the final home of yours.

Boards or areas are categorized into 4 areas of 6 points. 1-6 our home board, 7-12 the "prevention" board, 13-18 opponent's home, and 19-24 destination home.
The most important boards generally(with millions of exceptions unfortunately) are prevention board and opponent's board as also the first or second point(19 or 20) of destination board. But it depends on the opponent's distribution of checkers of course and his and our rolls.
But as a general rule: in the opening don't try to create too hard your home board but advance.

4...13-19, 13-17 Now this is debatable if it's the correct play. The other stronger alternative is 16-2 to press opponent's board while our board is perfectly safe(only 66 can threat it seriously). The played move, 13-9 13-17, covers the 6 point of black so it's a strong move. As i've mentioned previously the 19 point is very strong. In this case it's tough to say if with a 5 white would like to take it, but i think the answer is NO but it's not so easy to be sure.
Anyway to return to 16-2 or 13-9,13-17 debate perhaps both plays are equally good and they just represent different strategies.

5. 1-7, 1-5 ?? And this is a serious blunder. Very serious for 2 reasons: It doesn't cover the glorious 5 point of black(the 18 point). It allows black to create a !very! strong 4-prime if he gets a 5 next turn. And that kind of 4- prime for those who know the game is one of the strongest possible. So the strongest move is by far 1-7,14-18.

5...13-19, 13-19, 13-19, 13-19?? Very bad move. Does not understand the concept. Black !has! to bring another checker in opponent's home. Correct move by far is 13-19(2),16-22-4.
Now white even after his previous very bad moves, because of this time black lost with the big 66 and of course because of the wrong play, stands better.

6. 5-8, 1-2 Now this is very interesting position. The move played is very strong, to close everything in white's board. But it's not easy to say this. 14-18 i think would still be the best move here. The problem for black is he is behind on time so seemingly he can create a strong home and prevention board so black will get stuck behind it and eventually open first his primes.
But if you look closely the board, black is not so much behind on time and those 5 concentrated checkers on the 19- point give many plays. So if he gets his 5 home point and not get big doubles or 33, he is perfectly fine. Still worse(remember that the move played was very strong) but not by much. It's tough to decide between these 2 alternatives really.

6...19-22, 22-4 black gets a bit lucky here.

7. 1-6, 1-5? I just don't see why such unwillingness to play 14-18 here. Bad move again played here. White has to Just get the 5 point. It's his passage to the destination home.

7...13-17, 17-18

8. 5-8, 8-9

8...4-10, 13-18? Bad move. Black has to lose time and not bring another checker down from the "mana". He had to play 4-10, 19-24.

9. 7-12, 12-15?! Hmm giving the 7-point may be a bad decision. Black can take it and then white will not have an eays life with 6's and he will have to abandon another blot as he has no spare checkers. Also remember that black can safely take the 7-point and not be afraid of being primed at the home board of white, as white is not allowed to cover all 6 points of his board, so black can abandon the 4 point and to be like it has never did it(OK with 33 there is a difference but not crucial because of the 1/36). Also having a 2-3 distribution on opponent's home board does not put any real pressure on him. 1-6-9 is a better move.

9...13-19, 13-19, 13-19, 18-24 This is life. This is Backgammon, Fevga etc. Dice games generally. The opponent makes bad moves but he isn't punished for this. Actually he is in the long run, but in single games it's another story.
With these awful 66's white is now the clear favorite to win! Black is so much behind in time that he needs many small numbers(1,2) or white to get a 33 now.

10. 1-5, 5-7

10...13-19, 19-20!? Perhaps a dubious move, but maybe not. As i've said the blot on 4- point is almost useless as a blocking one(almost means 35/36 because a 33 is another story) and even if it wasn't there white isn't allowed to prime his home board. So black had to put pressure on white by bringing another probably permanent checker on his destination area by 4-10-11.

But maybe the move played is not bad after all, because of 2 reasons. First the 19-20 move is a very stong one and restricts heavily white's movement. And secondly if you observe white's board you will see no spare checkers so no flexibility at all. He has to leave blots to create new ones. With that in mind the original play may be the best after all.


11. 15-21, 1-3 A very important move is the 15-21. It gives a standing point where white can play. But it's nevertheless not so important now as white is the clear favorite anyway because of that awful 66 of black and because black was unwilling too to advance in the opening stages of game, his checkers to white's home.

11...19-22, 13-15

12. 1-5, 5-9, 9-13, 1-5?? A good roll that turns into an unfortunate roll because of a very bad play. Now soon enough after i declared white as the clear favorite, black enters dynamically into the game again and has some good hopes. A bad played 44 also. White should !!!!by all means!!!! have covered the 11 point as now with a 61 black takes it and also with a single 1 black should take it too to put more pressure to white. Also white should have left the spare checker on the 9 point and not play 9-13 as it is better to wait for a 5 and put that checker in the 14 point.
Correct play is 1-5-9, 3-7-11

12...19-24, 19-24, 18-23, 23-4 Oh God . 55's! This happens the worst time again. It's not a complete disaster for black as now although black is well behind in time and maybe get stuck and lose easily, he may also not get stuck and being so much ahead on pips will make him the favorite.
Probability is to get stuck, so he is the favorite to lose, but we will see.


13. 14-18, 21-23! Excellent move! Both moves make perfect sense.

13...24-4, 19-22

14. 18-21, 5-7?! This is a dubious move because of 5-7?. 18-21! was an excellent move as now the 18-point is much weaker than every point in the very important destination board. So white is correct to take every destination board that he is given. But 5-7? is bad as a 33 will mean a disaster for white. Instead of 5-7? a 1-3 would be more strong.
Remember Fevga(as like Backgammon and Plakoto and all Backgammon type games) are not about "Oh get real, is it possible to have a 33 now? That would be too unfortunate." Backgammon is about equity. And equity here must say that we HAVE to take into consideration and the 1/36 possibility of 33 so equity for 1-3 is bigger than that of 5-7.

But let's see it from another perspective. White is so much behind on pips. And if black manages to take the 11- point this will have a double super effect. White will suffer to take his checkers out quickly and effectivelly too, but also black will have deep board supporters for getting his checkers for bearing off. This is crucial and white should not let it happen. So perhaps instead of the move played, playing 6-11 is the best move. Black has not enough time and the checkers remained behind will have to move soon enough so white will get his checkers inside the destination.
One clear weakness 6-11 move creates is the obvious hole in the 6-point. But is it really so important? White will be able to bring his checkers out of home very easily. But the dagger in black's board the important 11-point will make black to stuck behind and waste many many rolls as he will not be able to enter his home board effectively as white would have 4 blots there. So eventually white will be able to enter easily(because of black not having enough time so he would move his checkers from white's destination area) to his destination area. It's a kind of duplication also as black needs 6 for playing on the 4-point and 6 also for playing into the 6-point.
And in stuck situations where one has stuck outside his board, the side that has stuck is losing badly.

So after all i think 6-11! was a truly great move and could have been played also. But playing 18-21,1-3! was very very strong too.



14...4-10, 10-11 Now white is in trouble. Had he covered that 11 point as i've said in a previous move this would not happen. By in trouble of course i mean that he has lost several points of equity but he is again the favorite to win but in a less extent than before.


15. 13-18, 1-5 19-22, 16-19, 19-22, 19-22

16. 5-8, 8-13 I'm not sure this is correct but it's highly technical and i'm lazy right now to count possibilities and cases. However it seems better to bring a checker from the "mana(1-point) by 1-5 for flexibility issues.

16...17-20, 15-17?! Dubious i guess. Again it's technical and i'm lazy to analyze it right now but 22-24 seems a move that had to be played. 2's are not easy to find so a spare checker there for a freeing 4 was better.


17. 3-6, 6-9, 9-12, 12-15

17...20-24, 24-4, 20-24, 24-4 And ta-daa, had black had another checker on 24-point and now black would not had to leave the 20-point. Not that it is too crucial right now but anyway.


18. 7-9, 13-14 4-10, 24-4

19. 14-16, 1-2

19...17-22, 10-12 Now the troubles of white by not covering that 11-point are seen clearly. Of course white still has the advantage but why to decrease your advantage, even by a bit?


20. 9-14, 18-20 19-24
21. 2-6, 14-18, 15-19, 16-20 11-12
22. 6-11, 18-21 pass

23. 1-3, 3-6?! I don't get this.Why to make life easier for black? Just sit there with 20-23,21-23 and wait. Anyway white is the big favorite to win either way. But now a 33 for black can make a difference. Why to allow that i don't understand.
Problem for white here is that black has plenty of 2's to play so he would not get that 16-point also. It will be a good battle but still white is the favorite.

23...22-4

24. 2-5,6-7?? 2-5 ????
Why to play 2-5? This is a serious blunder. Makes life of black much easier as it has many landing points and now black gets into the game very dynamically although white is still the favorite to win, but white lost even more equity.
6-9, 20-21 has to be the best play i guess.

3. Januar 2009, 16:35:49
rod03801 
Emne: Re:
Constellation36: Very interesting! Thanks for that.

I am terrible at Fegva, but I enjoy it. LOL.

3. Januar 2009, 18:09:23
Constellation36 
Emne: Re:
rod03801: I've seen one of your games and indeed, you played terribly. :-)

One notice about Fevga in Brainking. It would be a good idea to allow doubles in the opening roll of a player(i saw many games and never saw a double in the beginning) as this is how it's played in Greece. It makes the game more "unfair" but not by much and anyway i don't think it matters also.

3. Januar 2009, 18:12:14
Fencer 
Emne: Re:
Constellation36: Nice analysis. Would you mind if I post it to BrainRook.com site?

3. Januar 2009, 18:43:14
Constellation36 
Emne: Re:
Fencer: No problem.

4. Januar 2009, 03:38:01
coan.net 
Emne: Re:
Constellation36: I would also like to say that the write up is very helpful. From my own playing, I have seen and already picked up that the first & second space in the destination home is important, and I do try to go after that as quickly as possible - but there are many other tips that will hopefully help my games..... Fevga is one of my favorite gammon games right now.

Too bad none of the tips could have helped me out in this game: Fevga (Albaowl vs. coan.net)

4. Januar 2009, 12:58:22
Constellation36 
Emne: Re:
coan.net: Too bad none of the tips could have helped me out in this game: Fevga (Albaowl vs. coan.net)

Oh my goodness!!!!!!!! That is the definition of "bad luck".

By calculating only your rolls(as calculating opponents rolls is a bit more tiresome and i'm lazy) the probability NOT to enter opponents board is:
0.047% or 1 out of 2115.

So the probability to enter opponents home(so you will be free to play later) is 99.95% or 2114 out of 2115.

And notice that the above do not take into account opponent's rolls, a thing that would actually increase your probabilities to enter.

So it's like you had a bag with 2114 white balls and only 1 red ball and you have chosen the red ball!
And note again that i have not taken into consideration the opponent's rolls that i guess would increase this probability to enter by a factor of 10(21139 out of 21140).

So many years i'm playing this game only once i have faced this situation and i was in the bright side, which means i forced my opponent not to be able to play at all.
And now i see it again.

Also notice what i've said a few lines before in this topic. In Greece we allow doubles in the starting roll for Fevga in contrast with what Brainking does. So there are 5 more cases(22,33,44,55,66) where one can advance high enough to enter opponents home or anyway to take the 12-point which is the key to avoid such position as then he will always have the change to so this can't happen.
So once again i will repeat that it is better if doubles will be allowed in the starting roll.

Of course what happened to you is extremely rare(writing a Monte Carlo based program to play millions of random rolls would easily show how exactly are the odds) and by allowing starting roll doubles becomes even more rare.

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