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Problem Display

PID: 231548 (8/8/8/4n3/4Q3/1Pk1p3/4K3/1R6 w - - 0 1)

Schiffert, Gyorgy

Magyar Sakkvilag, 1927

8/8/8/4n3/4Q3/1Pk1p3/4K3/1R6

#2

4 + 3

6490	yacpdb	2021

SOLUTION

SOUND
Sets
- 1...Sd3
  - 2.Qc4#
- 1...Sf3
  - 2.Qc4#
- 1...Sc4
  - 2.Qxc4#
- 1...Sg4
  - 2.Qc4#
- 1...Sc6
  - 2.Qc4#
- 1...Sg6
  - 2.Qc4#
- 1...Sd7
  - 2.Qc4#
- 1...Sf7
  - 2.Qc4#
Tries
- 1.Kd1?
  - 1...Sc4
    - 2.Qxc4#
  - 1...Sd3
    - 2.Qc4#
  - 1...Sf3
    - 2.Qc4#
  - 1...Sg4
    - 2.Qc4#
  - 1...Sc6
    - 2.Qc4#
  - 1...Sg6
    - 2.Qc4#
  - 1...Sd7
    - 2.Qc4#
  - 1...Sf7
    - 2.Qc4#
  - 1...e2+!
- 1.Kxe3?
  - 1...Sc4+
    - 2.Qxc4#
  - 1...Sd3
    - 2.Qc4#
  - 1...Sf3
    - 2.Qc4#
  - 1...Sc6
    - 2.Qc4#
  - 1...Sg6
    - 2.Qc4#
  - 1...Sd7
    - 2.Qc4#
  - 1...Sf7
    - 2.Qc4#
  - 1...Sg4+!
- 1.Qa4?
  - 1...Sc4
    - 2.Qxc4#
  - 1...Sd3
    - 2.Qc4#
  - 1...Sf3
    - 2.Qc4#
  - 1...Sg4
    - 2.Qc4#
  - 1...Sc6
    - 2.Qc4#
  - 1...Sg6
    - 2.Qc4#
  - 1...Sd7
    - 2.Qc4#
  - 1...Sf7
    - 2.Qc4#
  - 1...Kc2!
- 1.Qd4+?
  - 1...Kc2
    - 2.Qb2#
  - 1...Kxd4!
- 1.Qf4?
  - 1...Sc4
    - 2.Qxc4#
  - 1...Sd3
    - 2.Qc4#
  - 1...Sf3
    - 2.Qc4#
  - 1...Sg4
    - 2.Qc4#
  - 1...Sc6
    - 2.Qc4#
  - 1...Sg6
    - 2.Qc4#
  - 1...Sd7
    - 2.Qc4#
  - 1...Sf7
    - 2.Qc4#
  - 1...Kc2!
- 1.Qxe5+?
  - 1...Kc2
    - 2.Qb2#
  - 1...Kb4!
Keys
- 1.b4!
  - 1...Sd3
    - 2.Qxd3#
  - 1...Sf3
    - 2.Qd3#
  - 1...Sc4
    - 2.Qd3#
  - 1...Sg4
    - 2.Qd3#
  - 1...Sc6
    - 2.Qd3#
  - 1...Sg6
    - 2.Qd3#
  - 1...Sd7
    - 2.Qd3#
  - 1...Sf7
    - 2.Qd3#

FEATURES

Static
- TYPE = MUTATE
- CHANGED MATES = 8
- ADDED MATES = 0
- REMOVED MATES = 0
Sets
- S(c);N_GUARD::QAR1(D)
- S(c);N_GUARD::QAR1(D),XS(c)
Tries
- Try
  - K(B);S_FLIGHT
  - Vars
    - S(c);N_GUARD::QAR1(D),XS(c)
    - S(c);N_GUARD::QAR1(D)
  - Refutation
    - P(b);CHECK
- Try
  - K(B);P-FLIGHT,XP(b)
  - Vars
    - S(c);CHECK,N_GUARD::QAR1(D),XS(c)
    - S(c);N_GUARD::QAR1(D)
  - Refutation
    - S(c);CHECK
- Try
  - Q(D);
  - Vars
    - S(c);N_GUARD::QAR1(D),XS(c)
    - S(c);N_GUARD::QAR1(D)
  - Refutation
    - K(a);P-FLIGHT
- Try
  - Q(D);CHECK
  - Vars
    - K(a);OGATE,P-FLIGHT::QAR1(D)
  - Refutation
    - K(a);S_FLIGHT,XQ(D)
- Try
  - Q(D);
  - Vars
    - S(c);N_GUARD::QAR1(D),XS(c)
    - S(c);N_GUARD::QAR1(D)
  - Refutation
    - K(a);P-FLIGHT
- Try
  - Q(D);CHECK,XS(c)
  - Vars
    - K(a);OGATE,P-FLIGHT::QAR1(D)
  - Refutation
    - K(a);S_FLIGHT
Actual
- P(C);
- Vars
  - S(c);N_GUARD::QAR1(D),XS(c)
  - S(c);N_GUARD::QAR1(D)

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).