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Game Reviews by Carlos Cetina

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Venomous. New system of chess on 10x10 board with new pieces: the Sorcerer Snake and the even more venomous Sissa. (10x10, Cells: 100) [All Comments] [Add Comment or Rating]
Carlos Cetina wrote on 2009-07-01 UTCExcellent ★★★★★

I cannot less than celebrate, Charles, your choice of including the sissa in one of your game designs. Excellent!

Certainly, this piece has not been adequately explored in other chess systems. I have had the oportunity of seeing some of its peculiarities on an 8x8 board starting from the randomly positions of my Cetina Random Chess and Cetran Chess 2 proposals.

'Instead of boring the player with arcane references to complex, convoluted, and contrived theoretical jargon,...', as you just say, I would like to show here some samples of THE SISSA IN ACTION!

At the following position White to move:

White moves Sc1+ [moving path: d1-c2-c1 or d1-d2-c1 / checking path: c1-h1-c6]:

At the same time the sissa is menacing the rook by c1-c2-b3 or c1-b2-b3. Obviously if Blue moves his king, would lose his rook. Fortunately Blue has salvation by moving Rf3 that obstructs the h1-c6 diagonal, interrupting, cutting the check:

At the following position Blue to move:

In the real game Blue moved Kd5, but what would happen if he moves c4?...

... White would make Sa5+...

... moving path: b3-a4-a5 / checking path: a5-b5-c6. Notice that the sissa covers both b5 (a5-a6-b5 or a5-a4-b5) and d5 (a5-a8-d5). Blue is losing his pawn on c4, so Kc5 is unique...

But now White makes the surprising and spectacular movement Se5+!

Moving path: a5-a1-e5 / Checking path: e5-c7-c5 or e5-e7-c5 or e5-e3-c5.

The sissa covers
b5 by e5-e8-b5;
c6 by e5-d5-c6 or e5-d6-c6 and
d5 by e5-d6-d5 or e5-d4-d5 or e5-e6-d5 or e5-e4-d5.

Blue has two options: Kd6 and Kd4. If makes Kd6, obviously would lose his pawn on c4. And if he makes Kd4? Let's see it:

Then White wins the rook by moving Sd7+...

...moving path: e5-e6-d7 or e5-d6-d7 / checking path: d7-g7-d4 or d7-g4-d4. The rook is captured by d7-c7-b6 or d7-c6-b6.

Viewing these examples of what the sissa can do on an 8x8 board, we can hope reasonably that on a 10x10 its powerful will be increased greatly, overall by acting in combination with the remain venomous pieces.

Ajax Orthodox Chess. Orthodox Chess with Ajax-Chessmen, and droping Ajax-Ministers. (8x8, Cells: 64) [All Comments] [Add Comment or Rating]
Carlos Cetina wrote on 2010-01-10 UTCExcellent ★★★★★
The additional Commoner moves to rooks, knights and bishops increases the complexity of the game in a manner so exquisite that immediately induces me to transfer the concept to the symmetric setup on a 9x8 board.

José: Would you like to try it? I bring forward a fantastic game! We could play it with or without dropping ministers, as you like.

Following Fergus's suggestion for naming the symmetric setup, I would name this new variant: Ajax Bigamous Chess.

There is no queen, but 2 compounds. Missing description (9x9, Cells: 81) [All Comments] [Add Comment or Rating]
Carlos Cetina wrote on 2010-07-16 UTCExcellent ★★★★★
Daniil: Your proposal seems to me very interesting. I have edited a preset for playing on a 9x8 board.

Preset's URL: /play/pbm/play.php?game%3DThere+is+no+queen+but+two+compounds%26settings%3D9x8

Please let me know if you would like to try it.

Nachtmahr. Game with seven different kinds of Nightriders. (8x8, Cells: 64) [All Comments] [Add Comment or Rating]
Carlos Cetina wrote on 2014-09-19 UTCExcellent ★★★★★
Thank you, Jörg. I did not know the Jelliss' writing "Theory of Journeys". I will study it carefully.

We can get a first approach to the relative strength of these nightriders by placing them on the central square (g7) of a 13x13 board and counting the number of squares affected/checked from there.

Doing it, we would find these results:

NN11 Diagonal Wide Crooked Nightrider 56
NN02 Straight Wide Crooked Nightrider 36
NN31 Quintessence 36
NN00 Rose 32
NN33 Diagonal Narrow Crooked Nightrider 24
NN21 Standard Nightrider 24
NN04 Straight Narrow Crooked Nightrider 20

Hence, the following equivalences should be near to be true:

NN11 = NN00 + NN33 = NN00 + NN21 = NN31 + NN04 = NN02 + NN04

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