MESON Chess Problem Database

Problem Display
PID: 118733 (5kr1/4p1N1/4K3/6P1/8/8/8/Q7 w - - 0 1)

Stepanov, Petr Aleksandrovich

Krasnoe Znamya, 1959

5kr1/4p1N1/4K3/6P1/8/8/8/Q7

#2

4 + 3

5454 Near Snap 2009
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg7
      • 2.Qa8#
  • Tries
    • 1.Sf5?
      • threat
        • 2.Qa8#
      • 1...Ke8
        • 2.Qa8#
      • 1...Rg6+!
    • 1.Sh5?
      • threat
        • 2.Qa8#
      • 1...Ke8
        • 2.Qa8#
      • 1...Rg6+!
    • 1.Qb2?
      • 1...Rxg7
        • 2.Qb8#
      • 1...Rh8!
    • 1.Qc3?
      • 1...Rxg7
        • 2.Qc8#
      • 1...Rh8!
    • 1.Qd4?
      • 1...Rxg7
        • 2.Qd8#
      • 1...Rh8!
    • 1.Qe5?
      • 1...Rxg7
        • 2.Qb8#
      • 1...Rh8!
    • 1.g6?
      • 1...Rxg7
        • 2.Qa8#
      • 1...Rh8!
  • Keys
    • 1.Qh1!
      • 1...Kxg7
        • 2.Qh6#
      • 1...Rxg7
        • 2.Qa8#
      • 1...Rh8
        • 2.Qxh8#

Anticipated by 92259(1905), 190048(1913), 18832(1958)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(c);SBLOCK,XS(D)::QAR(A)
  • Tries
    • Try
      • S(D);
      • Threat
        • QAR(A)
      • Vars
        • K(b);P-FLIGHT::QAR(A)
      • Refutation
        • R(c);CHECK
    • Try
      • S(D);
      • Threat
        • QAR(A)
      • Vars
        • K(b);P-FLIGHT::QAR(A)
      • Refutation
        • R(c);CHECK
    • Try
      • Q(A);
      • Vars
        • R(c);SBLOCK,XS(D)::QAR(A)
      • Refutation
        • R(c);
    • Try
      • Q(A);
      • Vars
        • R(c);SBLOCK,XS(D)::QAR(A)
      • Refutation
        • R(c);
    • Try
      • Q(A);
      • Vars
        • R(c);SBLOCK,XS(D)::QAR2(A)
      • Refutation
        • R(c);
    • Try
      • Q(A);
      • Vars
        • R(c);SBLOCK,XS(D)::QAR(A)
      • Refutation
        • R(c);
    • Try
      • P(B);
      • Vars
        • R(c);SBLOCK,XS(D)::QAR(A)
      • Refutation
        • R(c);
  • Actual
    • Q(A);
    • Vars
      • K(b);OGATEB,S_FLIGHT,XS(D)::QAB1(A)
      • R(c);SBLOCK,XS(D)::QAR(A)
      • R(c);OGATEB::QAR2(A),XR(c)
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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).