MESON Chess Problem Database

Problem Display
PID: 180290 (1B6/8/2K1kPRN/4N1r1/6P1/3P1P2/8/7Q w - - 0 1)

Lider, Valentin Viktorovich

Sinfonie Scacchistiche, 1972

1B6/8/2K1kPRN/4N1r1/6P1/3P1P2/8/7Q

#2

10 + 2

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rf5
      • 2.gxf5#
  • Tries
    • 1.Qe1?
      • 1...Rxg4
        • 2.Sexg4#
      • 1...Rxe5
        • 2.Qxe5#
      • 1...Rxg6
        • 2.Sd7#
      • 1...Rf5
        • 2.gxf5#
      • 1...Rh5!
    • 1.Qh3?
      • 1...Rxg4
        • 2.Qxg4#
      • 1...Rxg6
        • 2.g5#
      • 1...Rf5
        • 2.gxf5#
      • 1...Rh5
        • 2.gxh5#
      • 1...Rxe5!
    • 1.Qh4?
      • 1...Rxg4
        • 2.Qxg4#
      • 1...Rxe5
        • 2.f7#
      • 1...Rf5
        • 2.gxf5#
      • 1...Rh5
        • 2.f7#
      • 1...Rxg6!
    • 1.Qh5?
      • 1...Rxg4
        • 2.Qxg4#
        • 2.Qf5#
      • 1...Rxe5
        • 2.Qxe5#
      • 1...Rxg6
        • 2.Qf5#
      • 1...Rf5
        • 2.Qxf5#
        • 2.gxf5#
      • 1...Rxh5!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Sf8#
      • 1...Rc5+
        • 2.Sxc5#
      • 1...Rxg6
        • 2.Qe1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(a);OGATE::P(D),XR(a)
  • Tries
    • Try
      • Q(A);
      • Vars
        • R(a);XP(D)::QAR(A)+S(E),XR(a)
        • R(a);OGATE,P_SPINR(a),XS(E)::QAR1(A),XR(a)
        • R(a);N_GUARD,XR(H)::QAR(A)+S(E)
        • R(a);OGATE::P(D),XR(a)
      • Refutation
        • R(a);
    • Try
      • Q(A);
      • Vars
        • R(a);OGATE,P_SPINR(a),XP(D)::QAB(A),XR(a)
        • R(a);OGATE,XR(H)::QAB(A)+P(D)
        • R(a);OGATE::P(D),XR(a)
        • R(a);OGATE::QAB(A)+P(D),XR(a)
      • Refutation
        • R(a);XS(E)
    • Try
      • Q(A);
      • Vars
        • R(a);OGATE,XP(D)::QAB(A),XR(a)
        • R(a);N_GUARD,XS(E)::R(H)+P(G)
        • R(a);OGATE::P(D),XR(a)
        • R(a);N_GUARD::R(H)+P(G)
      • Refutation
        • R(a);XR(H)
    • Try
      • Q(A);
      • Vars
        • R(a);OGATE,XS(E)::QAR1(A),XR(a)
        • R(a);OGATE,XR(H)::QAB1(A)
      • Refutation
        • R(a);XQ(A)
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • R(a);CHECK,N_GUARD::S(E),XR(a)
      • R(a);N_GUARD,XR(H)::QAR(A)
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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).