# Cetina Random Chess

Carlos Cetina from Mexico invented this game in 1998. He based it on Fischer's form of Random Chess, and made some changes. In particular, he added the piece of Sissa, which also appears in some other games by Cetina.## Rules

The game is played on an 8 by 8 board.Each player has:

- one king (K)
- one sissa (S)
- one queen (Q)
- one chancellor (C) = rook + knight
- one rook (R)
- two bishops (B)
- one knight (N)
- eight pawns (P)

The starting position of the pieces (the non-pawns) is determined by hazard: a raffle per each player, that is, there are two independent raffles. This has a purpose: to avoid that the players could follow one respecting another symmetric schemes of development at the opening, and in consequence they have FROM THE BEGINNING to effort to encounter the best strategy for the development of their pieces.

The raffles, CONTRARILY TO FISCHER'S PROPOSAL, are absolute, genuine raffles, that is, they are accomplished WITHOUT RESTRICTIONS, WITHOUT CONDITIONS, and if the bishops fall on squares of a same color, then the BCR holds. (See below.)

Castlings are absolutely suppressed. If, in particular, the king falls on e1/e8 and the rook on a1/a8 or h1/h8, the castling may not be done.

## Moves of pieces

King, queen, rook, knight, and pawns move as in orthodox chess, except that pawns also may promote to sissa or chancellor, i.e., a player moving his pawn to the last row can choose to promote it to queen, rook, knight, bishop, sissa, or chancellor. The chancellor has the combined moves of rook and knight.
A *sissa* moves like the knight in
Coherent
Chess (another chess variant by Carlos Cetina), as follows:
in one turn, first, the sissa
moves one or more squares like a rook or a bishop, and then the sissa
moves the same number of squares like the other of the two (bishop or
rook.) So, the sissa has the following options:

- First, it moves a number of squares as a rook. Then it makes a corner of 45, 135, 225, or 315 degrees, and then moves the same number of squares as a bishop. All squares that are passed by must be empty, i.e., a sissa does not jump over pieces.
- First, it moves a number of squares as a bishop. Then, it makes a corner of 45, 135, 225, or 315 degrees, and then moves the same number of squares as a rook. Again, all squares passed by must be empty.

Bishop move as in orthodox chess, except when they start on squares of the
same color. In that case, the bishop conversion rule (BCR) holds:
In this case, bishops have, in addition to their normal diagonal
movement, one extra possibility
(which is, in a certain sense, also obligatory): the bishop moves one square
horizontally or vertically at the first time it moves during the game.
This may be done only once, with one of the
players bishops. Also, for one of the bishops of the player, the first move
made with this bishop must be of this special type. This move is called
*conversion*. Note that a player may choose which bishop he converts,
but if he makes a normal move with one of his bishops, the first move made
with the other bishop must be a conversion move. Note also that a player
never can make more than one conversion move in a game, and a promoted
bishop does not make conversion moves. It is possible to take a piece of
the opponent by conversion. (See also a
more detailed description of this `Bishops Conversion rule'.)

## Sample games

White: Carlos Cetina Villahermosa, Mexico Black: Angel Eboli April 20, 1998Comments by Carlos Cetina

+-----------------+ 8| q r b c s k b n | 7| p p p p p p p p | 6| . . . . . . . . | 5| . . . . . . . . | 4| . . . . . . . . | 3| . . . . . . . . | 2| P P P P P P P P | 1| S R Q B B N K C | +-----------------+ a b c d e f g hNOTE: After every sissa's move it's indicated between parenthesis the path by which the sissa is moved from one square to another. If there are more than one moving path, then they are separated by a period. If the sissa moreover gives check, then first are indicated the moving paths followed by the checking paths, separated by a diagonal. That is: (moving paths / checking paths).

1.e4 b6 2.Bf3 Bb7Now the g8-bishop must be converted. Consequently, it doesn't cover neither f7 nor h7.

3.d3 d5 4.exd5 Bxd5 5.Cg3 Ng6 6.c4 Bb7 7.Bxb7 Qxb7 8.Bc3 Nh4 9.d4 Sd6 (e8-d7-d6) 10.Qc2 Ng6?There is to consider this move as a serious strategic error. It's imprescindible, urgent to develop the g9-bishop. So, the correct move is 10. ... g6 following by ...Bg7 and ...Nf5, after which Black would have a solid structure.

11.Re1 Sxc4 (d6-d5-c4, d6-c5-c4)It is attacking to the c2-queen by c4-a4-c2 and c4-e2-c2, although the queen is protected by the a1-sissa by a1-b1-c2.

12.Qe2Double threat: to c4-sissa and mate in two, by 13.Cxg6+ ... 14.Qxe7#

12. ... Se8 (c4-c6-e8)Now the sissa covers the e7-square by e8-d7-e7.

13.Qh5 h6 14.Cf3 Nh8 15.Se3 (a1-c1-e3) 15. ... Ce6 16.Sf5 (e3-e4-f5, e3-f4-f5) 16. ... Cg5 17.Cxg5 hxg5 18.Qxg5Threatening 19.Rxe7, and if 19. ... Sxe7??, then 20.Qxe7#. Note that 18. ... e6 is not possible because of the f5-sissa would give check by f5-c5-f8.

18. ... c6 19.d5Threatening mate in two: 20.Bxg7+ Bxg7 21.Qxg7#

19. ... Ng6 20.Ng3 Sd6 (e8-d7-d6) 21.Sh5 (f5-h3-h5, f5-f3-h5)The idea is to avoid an early sissa's exchange.

21. ... Sxd5 (d6-c5-d5, d6-e5-d5, d6-e6-d5) 22.Nf5 Sxg5 (d5-d2-g5)It's also possible 22. ... Sxh5 by the path d5-d1-h5.

23.Sxg5 (h5-h6-g5, h5-h4-g5, h5-g4-g5)Now the threat is 24.Bxg7+ Bxg7 (24. ... Ke8 25.Nd6+) 25.Sh7+ (g5-h6- h7 / h7-g8-f8) Kg8 26.Sxg7+ (h7-h8-g7, h7-h6-g7 / g7-f8-g8, g7-h8-g8, g7-h7-g8) Kf8 27.h4 e6 28.h5 exf5 29.Sxf5+ (g7-f6-f5 / f5-c5-f8, f5-c8- f8) Kg8 (unique) 30.hxg6 fxg6 31.Re8+! Kh7 [31. ... Rxe8 32.Sxb7 (f5- d7-b7)] 32.Sf8+ (f5-c5-f8 / f8-g8-h7, f8-g7-h7) Kg7 33.Rxb8 etc.

23. ... e5 24.Bxe5 Nxe5 25.Sxe5 (g5-e7-e5, g5-e3-e5, g5-g3-e5) 25. ... Qc7 26.Sf3+ (e5-e4-f3, e5-f4-f3 / f3-a3-f8) 26. ... c5Obstructing the a3-f8 diagonal.

27.Re7Threatening 28.Sxf7# (f3-b3-f7 / f7-e8-f8).

27. ... Qxe7Forced. It will be interesting to see the struggle sissa against R+B!

28.Nxe7 Kxe7 29.Se5+ (f3-f4-e5, f3-e4-e5 / e5-c7-e7, e5-g5-e7) 29. ... Ke8 30.Sxa7 (e5-c7-a7) 30. ... g6Some late!

31.g3 Bg7Too late!

32.b3 Bd4 33.a4 Kd7 34.Sb5 (a7-a6-b5) 34. ... Kc6 35.Kg2 Re8 36.Sa7+ (b5-a6-a7 / a7-b7-c6) 36. ... Kc7 37.Kf3 Re6 38.Sb5+ (a7-a6-b5 / b5-c6-c7) 38. ... Kc6 39.Sd1 (b5-d3-d1) 39. ... Rf6+ 40.Kg4Or 40.Kg2 Rxf2+ 41.Sxf2 (d1-e1-f2, d1-e2-f2) Bxf2 42.Kxf2 Kd5 43.Ke3 f5 44.h4 =

40. ... Rxf2 41.Sc1+ (d1-d2-c1, d1-c2-c1 / c1-h1-c6) 41. ... Kd5 42.h4 f5+ 43.Kh3Unique. Of course, 43.Kg5?? Be3+

43. ... Rf3 44.a5Looking for complications.

44. ... Rc3If 44. ... bxa5, then 45.Sxa5+ (c1-c3-a5, c1-a3-a5 / a5-d8-d5, a5-a8- d5)

45.Sd1+ (c1-c2-d1, c1-d2-d1 / d1-h1-d5) 45. ... Kc6 46.a6Looking for complications.

46. ... Rxb3 47.Sc1+ (d1-d2-c1, d1-c2-c1 / c1-h1-c6)It is menacing to the rook at the same time by c1-c2-b3 and c1-b2-b3.

47. ... Rf3Unique. Obstructing the h1-c6 diagonal.

48.h5!It's not possible 48. ... gxh5 because of the sissa would give check by c1-h6-c6.

48. ... b5 49.Sf7! (c1-c4-f7)It is menacing to the rook by f7-b3-f3.

49. ... Ra3 50.hxg6 Rxa6 51.g7 Bxg7If 51. ... Ra7??, then 52.Sxa7 (f7-a2-a7); and if 51. ... Ra8?, then 52.g8=S+ (g8-e8-c6) Rxg8 53.Se7+ (f7-f8-e7, f7-f6-e7, f7-e8-e7, f7-e6- e7 / e7-d7-c6, e7-d6-c6), winning the rook by e7-f7-g8 or e7-f8-g8.

52.Sxg7 (f7-f8-g7, f7-f6-g7, f7-g8-g7, f7-g6-g7) 52. ... b4 53.Sxf5 (g7-f6-f5, g7-g6-f5) 53. ... Rb6 54.Sb3! (f5-d3-b3, f5-d5-b3) 54. ... Kd5If 54. ... c4?, then 55.Sa5+ (b3-a4-a5 / a5-b5-c6) Kc5 [the sissa covers both b5 (a5-a6-b5, a5-a4-b5) and d5 (a5-a8-d5)] 56.Se5+! [(a5- a1-e5 / e5-c7-c5, e5-e7-c5, e5-e3-c5); now the sissa covers b5 (e5-e8- b5), c6 (e5-d5-c6, e5-d6-c6) and d5 (e5-d6-d5, e5-d4-d5, e5-e6-d5, e5- e4-d5)] Kd6 57.Sxc4+ (e5-d5-c4, e5-d4-c4 / c4-c5-d6, c4-d5-d6); or 56. ... Kd4?? 57.Sd7+ (e5-e6-d7, e5-d6-d7 / d7-g7-d4, d7-g4-d4), winning the rook by d7-g7-d4 or d7-g4-d4.

55.g4The sissa covers h6 by b3-e3-h6.

55. ... Ra6If 55. ... c4??, then 56.Sxb6+ (b3-e3-b6 / b6-c6-d5, b6-c5-d5); and if 55. ... Kc4??, then 56.Sb2+ [(b3-a3-b2, b3-a2-b2, b3-c3-b2, b3-c2-b2 / b2-b3-c4, b2-c3-c4); the rook is menaced by b2-f6-b6] Kd4 (obstructing the b2-f6 diagonal; note that the sissa covers b5 by b2- e2-b5) 57.Sa4+ (b2-a3-a4, b2-b3-a4 / a4-a1-d4, a4-d7-d4, a4-d1-d4), winning the rook by a4-a5-b6 or a4-b5-b6.

56.Sb1+ (b3-d3-b1, b3-d1-b1 / b1-b3-d5, b1-d3-d5) 56. ... Kd4 57.g5 Kd3?Perhaps it would be better 57. ... Ra3+ 58.Kg4 Rc3.

58.Sc1+ (b1-b2-c1, b1-c2-c1 / c1-c2-d3, c1-d2-d3) 58. ... Kd2Unique. The sissa covers c2 (c1-d1-c2, c1-d2-c2, c1-b1-c2, c1-b2-c2), c3 (c1-a1-c3, c1-a3-c3, c1-e1-c3), c4 (c1-f1-c4, c1-f4-c4) and e2 (c1- d1-e2, c1-d2-e2); if 58. ... Kd4??, then 59.Sc2+ (c1-b1-c2, c1-b2-c2, c1-d1-c2, c1-d2-c2 / c2-c3-d4, c2-d3-d4), winning the rook by c2-a4- a6; and if 58. ... Ke3??, then 59.Sc2+ (c1-b1-c2, c1-b2-c2, c1-d1-c2, c1-d2-c2 / c2-d2-e3, c2-d3-e3), winning the rook by c2-a4-a6.

59.Sxc5 (c1-g1-c5) 59. ... Ra3+ 60.Kg4 Rc3Black's position is quite hopeless.

61.Se4+ (c5-d5-e4, c5-d4-e4 / e4-d3-d2, e4-e3-d2)After this, Black resigned. There is no manner to save the game. For example, 61. ... Kd3 62.Sxb4+ (e4-e7-b4, e4-b7-b4 / b4-c4-d3) Kd2 63.Sd5+ (b4-c4-d5, b4-c5-d5 /d5-a2-d2, d5-g2-d2) Kc2 64.Sxc3+ (d5-d4- c3, d5-c4-c3 /c3-b3-c2, c3-b2-c2, c3-d3-c2, c3-d2-c2) Kxc3 65.g6 etc.

White: Jose Martin Torres Villahermosa, Mexico Black: Carlos Cetina May 9, 1998 +-----------------+ 8| r k b b c s q n | 7| p p p p p p p p | 6| . . . . . . . . | 5| . . . . . . . . | 4| . . . . . . . . | 3| . . . . . . . . | 2| P P P P P P P P | 1| Q K R N B C B S | +-----------------+ a b c d e f g h 1.g3 b6 2.Nc3 Bb7 3.e4 e6If 3. ... f5?, then 4.Sxf5 (h1-f3-f5)

4.Bg2With this move the bishops' status is definitively established; so, the e1-bishop is already of dark squares.

4. ... f5 5.Ce3 g5 6.f4 Ng6 7.exf5 Bxg2 8.Cxg2 Sxf5 (f8-c5-f5) 9.g4 Sf8 (f5-c5-f8) 10.fxg5 Bxg5 11.h4 Bf6If 11. ... Nxh4?, then 12.Bxh4 Bxh4 13.Cxh4 Sxh4?? (f8-f6-h4, f8-h6- h4) 14.Sxh4 (h1-e1-h4).

12.Ne4 Bh8 13.Bg3 d5 14.Ng5 h6 15.Rf1 Sd7 (f8-e7-d7) 16.Nf3 a5 17.h5 a4! 18.hxg6 a3 19.c3?!Preferable 19.d4

19. ... Qxg6+ 20.Kc1 axb2+ 21.Qxb2 Kb7 22.Cf4 Qg9 23.Re1 Ra5 24.Cb4 Ca8 25.d4 c5 26.dxc5 Sxc5 (d7-d6-c5, d7-c6-c5) 27.Cd3Or 27.Be5 Bxe5 28.Nxe5 (28.Rxe5 is not possible because of the c5- sissa would give check by c5-g1-c1) Ra3 29.Cd3 Rxc3+ 30.Cxc3 Sxc3+ (c5-a5-c3, c5-a3-c3, c5-e3-c3 / c3-e3-c1) 31.Qxc3 Cxa2+ 32.Kd1 Cxc3+ 33.Kd2 d4!

27. ... Sc4+ (c5-d4-c4, c5-b5-c4, c5-b4-c4 / c4-f4-c1) 28.Kb1 Sxb2+ (c4-b3-b2 / b2-c2-b1, b2-c1-b1, b2-a1-b1) 29.Cxb2 Bxc3 30.Cc2 Rb5+ 31.Kc1 Qc8 32.Se7 (h1-h4-e7) 32. ... Bb2+ 33.Kd1 Qxc2+ 34.Kxc2 Ca3+ 35.Kd2??After 35.Kd1 Rc5!, White would be within the game yet.

35. ... Cxf3+ 36.Kd1 Cd3+ 37.Kc2 Cd4+ 38.Kb1 Cd2# * * * * * * * * * * * * * * White: Jose del Carmen Miranda Villahermosa, Mexico Black: Carlos Cetina May 15, 1998 +-----------------+ 8| s b k b r n c q | 7| p p p p p p p p | 6| . . . . . . . . | 5| . . . . . . . . | 4| . . . . . . . . | 3| . . . . . . . . | 2| P P P P P P P P | 1| S R C Q K B N B | +-----------------+ a b c d e f g h 1.f4 b6 2.Bf2 Bb7 3.Cd3 e6 4.b3 g5 5.Sa4 (a1-d4-a4) The b7-bishop cannot move along the h1-a8 diagonal because of the a4- sissa would give check by a4-a6-c8. 5. ... Kb8 Liberating the b7-bishop. 6.Bd4 Bf6 7.Bc3 gxf4 8.Cxf4 Ng6 9.Cc4 Bxc3 10.dxc3 Bd5 11.Cd4 c5 12.Cb5 Ne5 It would be highly risking for Black 12. ... Bc6 13.Cd6 Bxa4 14.bxa4, when a5 and g3 would be very strong White's moves. 13.Cd6 Bxg2 14.Cxe8+ Cxe8 15.Bxg2 d5 16.Qd2 Qg8 17.Qf4 Qxg2 18.Qxe5+ Kb7 19.Kd2 Sc7 (a8-b8-c7) 20.Nf3 f6 21.Qh5 Ce7 22.Rg1 Qf2 23.Rg3 If 23.Rg7?, then 23. ... Cxg7 24.Sxg7?? (a4-d7-g7) Sxg7 (c7-g3-g7). 23. ... Kc6 24.b4 b5 25.Sb2 (a4-a3-b2, a4-b3-b2) Unique. If 25.Sa3?? (a4-b3-a3), then 25. ... Sxa3 (c7-a5-a3). 25. ... Se3 (c7-e5-e3) The threat is 26. ... Qxe2+ 27.Kc1 Sxc3+ (e3-e5-c3 / c3-e1-c1, c3-e3- c1) 28.Kb1 Qd1#, when 29.Sxd1 (b2-c1-d1) is not possible because of the c3-sissa would give check by c3-b2-b1. 26.Nd4+ If 26.Ng1, then 26. ... Se4+ (e3-f3-e4, e3-d3-e4, e3-f4-e4, e3-d4-e4 / e4-e3-d2, e4-d3-d2) 27.Kd1 Qf1#, or 27.Kc1 Qe1#, or 27.Kd3 c4+ 28.Sxc4 (b2-b3-c4) bxc4# 26. ... cxd4 27.Rxe3 Qxe3+ 28.Ke1 Unique. If 28.Kd1??, then 28. ... dxc3 with mate in the following move by ...Qd2 or ...Qg1. 28. ... Qxc3+ 29.Kd1 Qxb2 White resigns * * * * * White: Carlos Cetina Villahermosa, Mexico Black: Jose del Carmen Miranda May 15, 1998 +-----------------+ 8| c b r s b q k n | 7| p p p p p p p p | 6| . . . . . . . . | 5| . . . . . . . . | 4| . . . . . . . . | 3| . . . . . . . . | 2| P P P P P P P P | 1| B S B Q K C N R | +-----------------+ a b c d e f g h 1.b3 Ng6 2.h4 Nf4 3.Cg3 c6 4.Nh3 Cb6 5.c4 c5 6.Bc2 e5 7.Nxf4 exf4 8.Cg4 d5 9.cxd5 Cxd5 10.Bxh7+! Kxh7 11.Sxd5+! (b1-d3-d5 / d5-f5-h7) 11. ... Sxd5 (d8-g5-d5) 12.Cg5+! Sxg5 (d5-d8-g5) 13.hxg5+ Kg9 14.Qc2 f6?? Better 14. ... Qd6 15.Qh7+ Kf7 16.gxf6 Bb5 17.fxg7 Qxg7 Without comments! 18.Qxg7+ Ke6 19.Rh6+ Kd5 20.Qg5+ Be5 21.Qxe5# * * * * * White: Jose Martin Torres Villahermosa, Mexico Black: Carlos Cetina May 23, 1998 +-----------------+ 8| q c n b k s b r | 7| p p p p p p p p | 6| . . . . . . . . | 5| . . . . . . . . | 4| . . . . . . . . | 3| . . . . . . . . | 2| P P P P P P P P | 1| B Q C K S R B N | +-----------------+ a b c d e f g h 1.e4 e5 2.d3 The e1-sissa is menacing to the e5-pawn by e1-a5-e5. 2. ... Cc6 3.b3 Se6 (f8-e7-e6) 4.f4 exf4 5.Ce2 Bg5 6.d4 f6? Better 6. ... Cd6 7.d5 Cd6 8.Bc5 Now the a1-bishop doesn't affect the dark squares and its first move must be towards b1 or a2. 8. ... Se5 (e6-f5-e5) 9.Bxd6 Nxd6 10.Qb2 Sg6 (e5-f5-g6) 11.e5 Nf5 12.exf6+ Kd8 13.Qe6 Ne3+ 14.Cxe3 fxe3 15.fxg7 Sxe5 (g6-f6-e5, g6-f5-e5) 16.gxh8=Q Sg6 (e5-f6-g6, e5-f5-g6) 17.Qd4 Or 17.Sxg5 (e1-g3-g5) Sxh8 (g6-g7-h8) 18.c4 b5 19.Bb1 bxc4 20.bxc4 Qb7 21.Ke2 Qb2+ 22.Kf3 [22.Kxe3? Qe2+ winning the f1-rook since 23.Kxe2 is not possible because of the h8-sissa would give check by h8-e5-e2] e2 23.Re1 Qd2 24.h4? [the g5-sissa protects to the e1-rook by g5-g3-e1, but...] Sxh4+! (h8-d4-h4 / h4-g4-f3, h4-g3-f3) 25.Kf2 Qxg5 with a clear advantage for Black. 17. ... Bh6 18.Bb1 b6 19.c4 Sd6 (g6-g3-d6) 20.Qf6+ Sxf6 (d6-f8-f6, d6-f4-f6) 21.Rxf6 Bg7 22.Rf3 Bxd5?! 23.cxd5 Qxd5+ 24.Sd3 (e1-d2-d3, e1-e2-d3) 24. ... e2+ 25.Kxe2 Qe4+ 26.Kf2 Bd4+ 27.Kf1 c5?? 28.Sf4+ (d3-e3-f4 / f4-f6-d8) Black resigns Obviously, after 28. ... Qxf4 29.Rxf4, Black has no nothing to make in the game. * * * * * White: Carlos Cetina Villahermosa, Mexico Black: Carlos A. Cerino May 25, 1998 +-----------------+ 8| k q s c b b n r | 7| p p p p p p p p | 6| . . . . . . . . | 5| . . . . . . . . | 4| . . . . . . . . | 3| . . . . . . . . | 2| P P P P P P P P | 1| C R B K S B Q N | +-----------------+ a b c d e f g h 1.g3 c6 2.Bg2 d5 3.d4 e6 4.f4 Nf6 5.Nf2 Qc7 6.b4 Bd6 7.a4 Nd7 8.b5 cxb5 9.axb5 f6 10.Nd3 Nb6 11.Nc5 Bxc5 12.dxc5 Nc4 13.b6 Qc6 14.Cxa7+ Sxa7 (c8-b8-a7) 15.Ra1 Nxb6 16.cxb6 Cc8 17.Rxa7+ Kb8 18.Be3 Cxa7 19.bxa7+ Ka8 20.Bd4 Bg6 21.Qe3 Rc8 22.Qb3 Be4 23.Bxe4 dxe4 24.Qb6 Qxb6 25.Bxb6 g5? Preferable 25. ... f5. Of course, Black ought to resign rightnow! 26.Sxe4 (e1-h1-e4, e1-b4-e4) Menacing to the rook by e4-c6-c8. 26. ... Rc6 27.Bf2 b6 28.Sxf6 (e4-e5-f6, e4-f5-f6) Menacing to the rook by f6-c3-c6. 28. ... Rc7 29.Sxb6+ (f6-b2-b6 / b6-b7-a8) 29. ... Kxa7 30.Sb5+ (b6-a6-b5, b6-a5-b5, b6-c6-b5, b6-c5-b5 / b5-b6-a7, b5-a6-a7) 30. ... Ka6 31.Sxc7+ (b5-b6-c7, b5-c6-c7 / c7-b7-a6, c7-b6-a6) 31. ... Ka5 Unique. The sissa covers b7 (c7-b8-b7, c7-c8-b7, c7-b6-b7, c7-c6-b7) and b5 (c7-b6-b5, c7-c6-b5). Of course, it also covers a7 by c7-c5- a7, moreover of the bishop. 32.c3 Ka4 33.Kc2 gxf4 34.Sa7# (c7-c5-a7, c7-a5-a7 / a7-d7-a4, a7-d4-a4) The sissa covers a3 (a7-e7-a3), a5 (a7-c7-a5, a7-c5-a5) and b5 (a7-a6- b5, a7-b6-b5). * * * * * White: Carlos A. Cerino Villahermosa, Mexico Black: Carlos Cetina May 29, 1998 +-----------------+ 8| b c b s n k r q | 7| p p p p p p p p | 6| . . . . . . . . | 5| . . . . . . . . | 4| . . . . . . . . | 3| . . . . . . . . | 2| P P P P P P P P | 1| N C B K R S B Q | +-----------------+ a b c d e f g h 1.b3 b5 2.f3 a5 3.h4 Ca6 4.h5 h6 5.Cc3 b4 6.Cc4 d5 7.Cd4 c5 8.Cd3 Sd7 (d8-c7-d7) 9.g4 Nd6 10.Sg3 (f1-f2-g3, f1-g2-g3) 10. ... g6 11.hxg6 Rxg6 12.Bb2 Qh7 13.Bg2 Bc7 14.Sh5 (g3-h4-h5) Menacing to the d7-sissa by h5-f5-d7. 14. ... e6 Obstructing the mentioned path. 15.e4 d4 16.a3 Ne8 17.axb4 axb4 18.c3 bxc3 19.dxc3 Nf6 20.Sh4 (h5-g5-h4) 20. ... e5 21.f4 Nxg4 22.cxd4 exd4 23.f5 Rg5 24.b4 Sd6 (d7-e7-d6, d7-e6-d6, d7-c6-d6) Menacing to the d3-chancellor by d6-g3-d3. 25.e5 Obstructing the mentioned path. 25. ... Sxf5+ (d6-e6-f5 / f5-f3-d1) 26.Kc1 Bxg2 27.Qxg2 Se7 (f5-f6-e7, f5-e6-e7) 28.Cxc5?? Better 28.Sf3+ (h4-g3-f3 / f3-a8-f8) Kg8 29.Sxh7 (f3-f5-h7) Kxh7 30.bxc5 28. ... Ca2+ 29.Kd1 Qb1+ 30.Cc1 Sf5+ (e7-e6-f5, e7-f6-f5 /f5-f3-d1, f5-d3-d1) 31.Kd2 Cxb2+ 32.Cc2 Qxe1+ 33.Kxe1 Cd3+ 34.Kf1 If 34.Ke2, then 34. ... Sf4+ (f5-e4-f4 / f4-f3-e2, f4-e3-e2) 35.Sxf4 (h4-f2-f4, h4-h2-f4) Cxf4+ 36.Ke1 [36.Kd1 Ne3+ 37.Cxe3 Rxg2] Rxe5+ 37.Kd1 Cd3+ 38.Cd2 Ne3+ 39.Ke2 Cf4+ 40.Ke1 Nxg2+ 41.Kd1 Re1+ 42.Kc2 Ne3+ 43.Kb2 Nc4+ 44.Cxc4 Cd3+ 45.Kc2 Cc1+ etc. 34. ... Ne3+ 35.Cxe3 Cxe3+ 36.Kg1 Cf1#

Written by Carlos Cetina; parts added by Hans Bodlaender.

WWW page created: June 3, 1998. Last modified: March 9, 1999.