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Problem Display

PID: 227731 (8/8/8/6KN/6n1/7k/7n/4NbBQ w - - 0 1)

Pikler, Robert

Magyar Sakkvilag, 1926

8/8/8/6KN/6n1/7k/7n/4NbBQ

#2

5 + 4

6490	yacpdb	2020

SOLUTION

SOUND
Sets
- 1...Be2
  - 2.Qg2#
- 1...Bg2
  - 2.Qxg2#
- 1...Bd3
  - 2.Qg2#
- 1...Bc4
  - 2.Qg2#
- 1...Bb5
  - 2.Qg2#
- 1...Ba6
  - 2.Qg2#
- 1...Sf2
  - 2.Qxh2#
- 1...Se3
  - 2.Qxh2#
- 1...Se5
  - 2.Qxh2#
- 1...Sf6
  - 2.Qxh2#
- 1...Sh6
  - 2.Qxh2#
Tries
- 1.Sg3?
  - 1...Be2
    - 2.Qg2#
  - 1...Bg2
    - 2.Qxg2#
  - 1...Bd3
    - 2.Qg2#
  - 1...Bc4
    - 2.Qg2#
  - 1...Bb5
    - 2.Qg2#
  - 1...Ba6
    - 2.Qg2#
  - 1...Sf2
    - 2.Qxh2#
  - 1...Se3
    - 2.Qxh2#
  - 1...Se5
    - 2.Qxh2#
  - 1...Sf6
    - 2.Qxh2#
  - 1...Sh6
    - 2.Qxh2#
  - 1...Kxg3!
- 1.Sf6?
  - 1...Sxf6
    - 2.Qxh2#
  - 1...Be2
    - 2.Qg2#
  - 1...Bg2
    - 2.Qxg2#
  - 1...Bd3
    - 2.Qg2#
  - 1...Bc4
    - 2.Qg2#
  - 1...Bb5
    - 2.Qg2#
  - 1...Ba6
    - 2.Qg2#
  - 1...Sf2
    - 2.Qxh2#
  - 1...Se3
    - 2.Qxh2#
  - 1...Se5
    - 2.Qxh2#
  - 1...Sh6
    - 2.Qxh2#
  - 1...Kg3!
- 1.Sg7?
  - 1...Be2
    - 2.Qg2#
  - 1...Bg2
    - 2.Qxg2#
  - 1...Bd3
    - 2.Qg2#
  - 1...Bc4
    - 2.Qg2#
  - 1...Bb5
    - 2.Qg2#
  - 1...Ba6
    - 2.Qg2#
  - 1...Sf2
    - 2.Qxh2#
  - 1...Se3
    - 2.Qxh2#
  - 1...Se5
    - 2.Qxh2#
  - 1...Sf6
    - 2.Qxh2#
  - 1...Sh6
    - 2.Qxh2#
  - 1...Kg3!
Keys
- 1.Qe4!
  - 1...Sf3+
    - 2.Qxf3#
  - 1...Sf2
    - 2.Qh4#
  - 1...Be2
    - 2.Qg2#
  - 1...Bg2
    - 2.Qxg2#
  - 1...Bd3
    - 2.Qg2#
  - 1...Bc4
    - 2.Qg2#
  - 1...Bb5
    - 2.Qg2#
  - 1...Ba6
    - 2.Qg2#
  - 1...Se3
    - 2.Qh4#
  - 1...Se5
    - 2.Qh4#
  - 1...Sf6
    - 2.Qh4#
  - 1...Sh6
    - 2.Qh4#

FEATURES

Static
- TYPE = MUTATE
- CHANGED MATES = 5
- ADDED MATES = 1
- REMOVED MATES = 0
Sets
- B(a);N_GUARD::QAB1(C)
- B(a);N_GUARD::QAB1(C),XB(a)
- S(d);N_GUARD::QAR1(C),XS(b)
Tries
- Try
  - S(E);
  - Vars
    - B(a);N_GUARD::QAB1(C)
    - B(a);N_GUARD::QAB1(C),XB(a)
    - S(d);N_GUARD::QAR1(C),XS(b)
  - Refutation
    - K(c);N_SPINS(b),P-FLIGHT,XS(E)
- Try
  - S(E);
  - Vars
    - S(d);N_GUARD,XS(E)::QAR1(C),XS(b)
    - B(a);N_GUARD::QAB1(C)
    - B(a);N_GUARD::QAB1(C),XB(a)
    - S(d);N_GUARD::QAR1(C),XS(b)
  - Refutation
    - K(c);N_SPINS(b),P-FLIGHT
- Try
  - S(E);
  - Vars
    - B(a);N_GUARD::QAB1(C)
    - B(a);N_GUARD::QAB1(C),XB(a)
    - S(d);N_GUARD::QAR1(C),XS(b)
  - Refutation
    - K(c);N_SPINS(b),P-FLIGHT
Actual
- Q(C);N_PINS(b)
- Vars
  - S(b);CHECK,N_GUARD::QAR2(C),XS(b)
  - S(d);OGATE::QAR1(C)
  - B(a);N_GUARD::QAB1(C)
  - B(a);N_GUARD::QAB1(C),XB(a)

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).