Tuesday, September 30, 2008

Nikos Pergialis (2)

We will see here some more of the compositions by the 'rembetis' Nikos Pergialis. We have limited our selection to directmate chess problems. As you will note, he likes to create problems having few pieces. In some of the problems he has cooperated with Mr Manos Pantavos.

The two-mover problem-235 has theme Dombrovskis.
The two-mover problem-236 has a good key and theme Pawn – Bishop Grimshaw (also known as Pickabish).
The two-mover problem-237 has theme Fleck.
The two-mover problem-238 has Quaternary Black Correction.
The three-mover problem-239 has theme X-flights and shows three model mates.
The two-mover problem-240 has theme 'changed mates' in a Zagoruyko frame of four phases.


(Problem 235)
Nikos Pergialis & Manos Pantavos,
[Skaki gia Olous], issue 11, May 2005,
Mate in 2.
#2 ( 9 + 2 )
[7K/3Q4/8/2P1k3/2s5/7P/2BP1SP1/6B1]

The problem contains the theme Dombrovskis.

Tries : {1.Qf5+? Kd4!}, {1.Qd6+? / Se4? S(x)d6!}, {1.Qd8? / Sh1? / Bh2+? Kf6!}, {1.Sg4+? Kf4!}.
Thematic tries :
{1.Kg7? [2.Bh2# (A)] Kf4! (a)},
{1.g3? [2.Sg4# (B)] Kf6! (b)}.

Key : 1.h4! (zz, zugzwang).
1...Kf4 (a) 2.Bh2# (A)
1...Kf6 (b) 2.Sg4# (B)
(non thematic variation 1...S~ 2.Qd6#)


(Problem 236)
Nikos Pergialis, 2008
original,
Mate in 2.
#2 ( 5 + 7 )
[7Q/2pbS3/4pK1p/5B2/3k4/4p3/2R5/7r]

Tries : {1.Sc6+? Kd5!}, {1.Kg6+? / Kf7+? e5!}, {1.Rc4+? Kxc4!}.

Key : 1.Qa8! [2.Qe4#]
1...Rh4 2.Qa1#
1...exf5 2.Qd5#

1...c6 2.Qa4#
1...Bc6 2.Qa7#
In the last two variations we observe a Pawn – Bishop Grimshaw intersection, which has the specific name Pickabish intersection.


(Problem 237)
Nikos Pergialis, 2000
original,
Mate in 2.
#2 ( 6 + 6 )
[8/6p1/6S1/3P1prp/2p3k1/Q1S5/5KP1/8]

Tries : {1.Qc1? Rxg6!}, {1.Qd6? h4!}, {1.Sc3~? c3!}.

Key : 1.Sd1! [2.Se3# / Qh3# / Qg3# / Qf3#]
1...c3 2.Se3#
1...f4 2.Qh3#
1...Rxg6 2.Qg3#
1...h4 2.Qf3#

The key introduces four threats but only one can be applied in each variation. The separation of the threats is the theme Fleck.


(Problem 238)
Nikos Pergialis, 1979
original,
Mate in 2.
#2 ( 8 + 2 )
[4S3/3rPK2/2k5/1R3S2/P1PR4/8/8/8]

Tries : {1.Rxd7? [2.Rc7#] Kxd7!}, {1.Rd6+? Rxd6!}, {1.Rdd5? [2.Rdc5#] Rxd5!}.

Key : 1.Ke6! (zz).
1...Ra7 / Rb7 / Rc7 / Rd6+ 2.R(x)d6#
1...Rd8 ( 2.Rd6? . Διόρθωση πρώτου βαθμού) 2.exd8=S#
1...Rxe7+ ( 2.Rd6? / exd8? . Διόρθωση δεύτερου βαθμού) 2.Sxe7#
1...Rd5 ( 2.Rd6? / exd8? / Se7? . Διόρθωση τρίτου βαθμού) 2.cxd5#
1...Rxd4 ( 2.Rd6? / exd8? / Se7? / cxd5? . Διόρθωση τέταρτου βαθμού) 2.Sxd4#

The bR moves in a Cross form and in four destinations is captured : Theme Grab. With each successive move the bR tries to "correct" all the weaknesses, which seem to be created by its unavoidable move.  Thus we have Quartenary black correction, with only ten pieces!


(Problem 239)
Nikos Pergialis & Manos Pantavos, 2000
original,
Mate in 3.
#3 ( 6 + 1 )
[7Q/4K3/8/P7/3S4/2k2P2/1S6/8]


Key : 1.Qh7! (zz).
1...Kb4 2.Qd3 (zz).
____2...Kxa5 3.Qb5#
____2...Kc5 3.Qc4#
1...Kxd4 2.Qd3+
____2...Kc5 3.Qc4#
____2...Ke5 3.Qe4#
1...Kd2 2.Qd3+
____2...Ke1 3.Qe2#
____2...Kc1 3.Qc2#
1...Kxb2 2.Qc2+
____2...Ka3 3.Qb3#
____2...Ka1 3.Sb3#

We see here the theme X-flights and the bK gets mated on the squares e1 – c1 – a1 – a3 – a5 – c5 – e5. Interesting construction with a flight-giving key, sacrificing a Knight.


(Problem 240)
Nikos Pergialis, 2000
original,
Mate in 2.
#2 ( 6 + 6 )
[1B6/8/pk1p4/Spp5/8/5p2/2R2K2/RQ6]

Tries :
{1.Rxc5? [2.Rc6#] (1...b4 / dxc5 2.Qxb4# / Qg6#) 1...Kxc5!},
{1.Rc4? (zz, 1...d5 2.Qg6#) 1...b4!},
{1.Qxb5+? (1...Kxb5 2.Rb2#) 1...axb5!},
{1.Qe1? (zz, 1...d5 / c4 2.Qe6# / Qe3#) 1...b4!}
Thematic tries :
{1.Qb2? (zz, 1...d5 / c4 2.Qf6# [A] / 2.Qd4# [B]) 1...b4!},
{1.Qc1? (zz, 1...d5 / c4 2.Qh6# [C] / 2.Qe3# [D]) 1...b4!},
{1.Qg1? (zz, 1...d5 / c4 2.Qg6# [E] / 2.Kxf3# [F]) 1...b4!},

Key : 1.Qb4! (zz)
1...d5 2.Qxc5# [G]
1...c4 2.Qxd6# [H]
(non thematic variation 1...cxb4 2.Rc6#).

We observe that two black defenses (here 1...d5 / c4 ), always the same, and in various phases of the problem (here the last three tries and the post-key play) are answered with changed mates by the White. This is a Zagoruyko 4x2 (four phases by two variations) frame of presentation of the changed mates theme.


{This post in Greek language).

2 comments:

stefano said...

(Problem 235)
It seems to me that there is another possible solution: 1.Ne4 followed by Bh2# . The key is covering the black squares, g5 in particular, as 1.h4 does.

I'm correct or I'm missing something?

Bye,
Stefano

Emmanuel Manolas said...

Thank you for your comment.
In the tries it is written {1.Se4? Sd6!}.
The move 1.Se4 closes the diagonal of wBc3. The threat is 2.Bh2+ but after 1...Sd6 the bK can escape to d5. If now 2.Qxd6+ the bK has a flight Kf5!