No.1576
Armin Geister & Daniel Papack
(Germany)
Original Fairy problems
JF-2020-II:
01.07.2020 - 31.12.2020
+/- Russian translation
| conditions | 'Mars Circe' | условия |
| Mars Circe: | Non-capturing moves are normal, but to capture a unit is transported to its Circe rebirth square, which must be vacant, before proceeding to move towards the captured unit, all as one move. “Mars Circe works as follows: Captures occur only as if the capturing piece is starting from its game array square (determined as usual in Circe). Thus for example a black king can capture only by arriving on d8/d7/e7/f7/f8, as if from e8. In Mars Circe, captured pieces usually disappear as in normal chess, but in combination with PWC they reappear on the square just vacated by the capturing piece (NOT its game array square, unless of course the capturer actually plays from that square).“ (CJF) |
No. 1576 Armin Geister &
Daniel Papack
Germany
original - 31.12.2020
white Qc1 Pf2g3f4 Rf1a2 Bg1g6 Kh2 Sa5
black Rg2b3 Kh3 Ph4 Bh7b6 Qe7 Sc8b1
#3 b) Sa5-->d4 10+9
Mars Circe
Mars Circe
Solution: (click to show/hide)
a)
1.Qc1-e3 ! threat:
2.g3-g4 threat:
3.Kh2-g3 #
1...Sc8-a7
2.Rf1-e1 threat:
3.Bg6*g2 # {(via f1)}
2...Sb1-d2
3.Bg1*d2 # {(via c1)}
1...Sc8-d6
2.Rf1-c1 threat:
3.Bg6*g2 # {(via f1)}
2...Sb1-d2
3.Kh2*d2 # {(via e1)}
1...Sb1-d2
2.Bg1*d2 + {(via c1)}
2...Rb3*a5 {(via a8)}
3.Kh2-g1 #
b) wSa5-->d4
1.Qc1-e3 ! threat:
2.g3-g4 threat:
3.Kh2-g3 #
1...Sc8-a7
2.Rf1-c1 threat:
3.Bg6*g2 # {(via f1)}
2...Sb1-d2
3.Kh2*d2 # {(via e1)}
1...Sc8-d6
2.Rf1-e1 threat:
3.Bg6*g2 # {(via f1)}
2...Sb1-d2
3.Bg1*d2 # {(via c1)
Author's solution without adjustments for the animation:
a) 1.Qe3 (2.g4 and 3.Kg3)
1... Sa7/Sd6 2.Re1/Rc1 (3.Bg6-f1xg2)
2... Sd2/Sd2 3.Bg1-c1xd2/Kh2-e1xd2
b) 1.Qe3 (2.g4 and 3.Kg3)
1... Sd6/Sa7 2.Re1/Rc1 (3.Bg6-f1xg2)
2... Sd2/Sd2 3.Bg1-c1xd2/Kh2-e1xd2}
(C+ by Popeye 4.85)
A problem for the New Year's Eve punch: The same solution - or not...?!
One of the best Mars Circe direct compositions I have seen in many years. The whole play – including the threat, tries and mates – is based on specific effects.
The position of the wS dictates the right continuation in the variations. The dual avoidance is the best feature of the problem and deserves to be fully explained in order to understand properly the right choice of the white second move.
Any move of wRf1 will create the threat 3.Bg6:g2 (via f1). The wRf1 can’t go to d1, because it occupies wQ rebirth square and will therefore gives the black King the flight g4. So, there are actually only two available options for the wR: c1 and e1.
In twin a) we have:
1… Sa7 2.Rc1? Sd2! and now 3.Kh2:d2 (via e1)?? is illegal due to the guard of d2 from bQ while 3.Bg1:d2 (via c1)?? is not possible due to the occupation of wB rebirth square
1… Sd6 2.Re1? Sd2! and now 3.Kh2:d2 (via e1)?? is not possible due to the occupation of wK rebirth square while 3.Bg1:d2 (via c1)?? is not mate, because black can play 3…Rb3:a5 (via a8)
In twin b) we have:
1… Sa7 2.Re1? Sd2! and now 3.Kh2:d2 (via e1)?? is not possible due to the occupation of wK rebirth square while 3.Bg1:d2 (via c1)?? is not mate, because black can play 3…Qe7:d4 (via d8)
1… Sd6 2.Rc1? Sd2! and now 3.Bg1:d2 (via c1)?? is not possible due to the occupation of wB rebirth square while 3.Kh2:d2 (via e1)?? is not mate, because black can play 3…Rb3:a2 (via a8)
Now we should try to understand why any Black move of bSc8 parries the threat. Initially the bRg2 is pinned by wPg3. After the first Black move, if White executes the threat 2.g4, then Black will be able to play 2…Bh7:g4 (via c8) and after 3.Kg3 Rh2! and the unpinned black Rook interferes just in time.
Yes, rich&deep. And the logic of the key can be gradually built through the tries which introduce the refutations that become defenses in the solution.
Plan relies on 1.g4?(2.Kg3#) Rb3-g3!, so bRb3 must be cut off by a key to prepare 2.g4
1.Qc3?(Qxb3?) does that but both 1…Sa7/Sd6! parry the threat (vacating c8) and refute because after 2.Re1(c1) Qe2(e1) 3.Bxg2+ Qf1!-parries the check. This introduces the defensive motif of 2…Sb1-d2=access to f1.
The key 1.Qe3 interferes with both Rb3$Qe7, turning the ‘dual refutation’ into the anti-dual defense.
Refutation relies on the single departure effect 1…Sc8~ with irrelevant arrival of bS. In the solution, the arrival is still not relevant for parrying the threat 2.g4 but has a respective harmful line-closing effect that creates the thematic content.
Actually, no dual continuation (in B2) is avoided, the arrival of bS actively creates one unique possibility for White. After 1.Qe3, removing bSc8 from the board does not create dualistic #2 (hypothetical 1…Sc8~ would refute).
Nobody mentioned the theme of reciprocally changed continuations … perhaps it’s too obvious to mention?