MESON Chess Problem Database

Problem Display
PID: 131 (4N2k/4BK2/5N1r/5Q2/8/8/8/8 w - - 0 1)

Lebedev, Aleksandr N

Uzbekistanskaya Pravda, 1930

4N2k/4BK2/5N1r/5Q2/8/8/8/8

#2

5 + 2

3296 Shakhmatny zadachi miniaturi 1987
3813 300 Sachmatu Uzdaviniu 1991

SOLUTION

  • SOUND
  • Sets
    • 1...Rh3
      • 2.Qxh3#
    • 1...Rh5
      • 2.Qxh5#
    • 1...Rxf6+
      • 2.Bxf6#
    • 1...Rh7+
      • 2.Qxh7#
  • Tries
    • 1.Sd6?
      • threat
        • 2.Qc8#
      • 1...Rxf6+
        • 2.Bxf6#
      • 1...Rh7+
        • 2.Qxh7#
      • 1...Rg6!
    • 1.Sc7?
      • threat
        • 2.Qc8#
      • 1...Rxf6+
        • 2.Bxf6#
      • 1...Rh7+
        • 2.Qxh7#
      • 1...Rg6!
    • 1.Qh3?
      • threat
        • 2.Qxh6#
      • 1...Rh7+
        • 2.Qxh7#
      • 1...Rh4
        • 2.Qxh4#
      • 1...Rh5
        • 2.Qxh5#
      • 1...Rxh3!
    • 1.Qg6?
      • threat
        • 2.Qxh6#
        • 2.Qg7#
        • 2.Qg8#
      • 1...Rh7+
        • 2.Qxh7#
      • 1...Rh1
        • 2.Qg7#
        • 2.Qg8#
      • 1...Rh2
        • 2.Qg7#
        • 2.Qg8#
      • 1...Rh3
        • 2.Qg7#
        • 2.Qg8#
      • 1...Rh4
        • 2.Qg7#
        • 2.Qg8#
      • 1...Rh5
        • 2.Qxh5#
        • 2.Qg7#
        • 2.Qg8#
      • 1...Rxg6!
    • 1.Qh5?
      • threat
        • 2.Qxh6#
      • 1...Rh7+
        • 2.Qxh7#
      • 1...Rxh5!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Sd6#
        • 2.Sc7#
        • 2.Sg7#
      • 1...Rxf6+
        • 2.Sxf6#
      • 1...Rh7+
        • 2.Sg7#
      • 1...Rg6
        • 2.Sg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(a);OGATEB::QAR(A),XR(a)
    • R(a);CHECK,OGATE,XS(B)::B(C),XR(a)
    • R(a);CHECK,N_GUARD::QAR1(A),XR(a)
  • Tries
    • Try
      • S(E);
      • Threat
        • QAR(A)
      • Vars
        • R(a);CHECK,OGATE,XS(B)::B(C),XR(a)
        • R(a);CHECK,N_GUARD::QAR1(A),XR(a)
      • Refutation
        • R(a);
    • Try
      • S(E);
      • Threat
        • QAR(A)
      • Vars
        • R(a);CHECK,OGATE,XS(B)::B(C),XR(a)
        • R(a);CHECK,N_GUARD::QAR1(A),XR(a)
      • Refutation
        • R(a);
    • Try
      • Q(A);P_PINR(a)
      • Threat
        • QAR2(A),XR(a)
      • Vars
        • R(a);CHECK,OGATE::QAR1(A),XR(a)
        • R(a);OGATEB::QAR(A),XR(a)
      • Refutation
        • R(a);N_SPINR(a),XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • R(a);CHECK,N_GUARD::QAR1(A),XR(a)
      • Refutation
        • R(a);XQ(A)
    • Try
      • Q(A);P_PINR(a)
      • Threat
        • QAR2(A),XR(a)
      • Vars
        • R(a);CHECK,OGATE::QAR1(A),XR(a)
      • Refutation
        • R(a);N_SPINR(a),XQ(A)
  • Actual
    • Q(A);
    • Threat
      • DUALS(3)
    • Vars
      • R(a);CHECK,XS(B)::QAR(A)+S(E),XR(a)
      • R(a);CHECK::QAR(A)+S(E)
      • R(a);::QAR(A)+S(E)
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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).