MESON Chess Problem Database

Problem Display
PID: 180252 (6N1/2K3pr/3N2P1/R2Pk2r/3pPp1p/8/b7/3Q4 w - - 0 1)

Lider, Valentin Viktorovich

4th Prize, Probleemblad 147. TT, 1985

6N1/2K3pr/3N2P1/R2Pk2r/3pPp1p/8/b7/3Q4

#2

8 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...d3
      • 2.Qa1#
  • Tries
    • 1.Qa4?
      • threat
        • 2.Qe8#
      • 1...d3
        • 2.Sf7#
      • 1...f3!
    • 1.Qg4?
      • threat
        • 2.Qe6#
      • 1...Bxd5
        • 2.Rxd5#
      • 1...Rf5
        • 2.Qxf5#
      • 1...f3
        • 2.Sf7#
      • 1...d3!
    • 1.Qe1?
      • threat
        • 2.Sf7#
      • 1...Bxd5
        • 2.exd5#
      • 1...d3
        • 2.Qc3#
        • 2.Qa1#
      • 1...Rf5
        • 2.exf5#
      • 1...f3!
  • Keys
    • 1.Qe2!
      • threat
        • 2.Sf7#
      • 1...Bxd5
        • 2.exd5#
      • 1...d3
        • 2.Qb2#
      • 1...f3
        • 2.Qh2#
      • 1...Rf5
        • 2.exf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATEB::QAB(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • P(b);::S(E)
      • Refutation
        • P(c);
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • B(a);OGATE,P_SPINB(a),XP(D)::R1(C),XB(a)
        • R(f);N_GUARD::QAR1(A),XR(f)
        • P(c);::S(E)
      • Refutation
        • P(b);
    • Try
      • Q(A);
      • Threat
        • S(E)
      • Vars
        • B(a);OGATE,P_SPINB(a),XP(D)::QAR(A)+P(B),XB(a)
        • R(f);OGATE::QAR(A)+P(B),XR(f)
      • Refutation
        • P(c);
  • Actual
    • Q(A);
    • Threat
      • S(E)
    • Vars
      • B(a);OGATE,P_SPINB(a),XP(D)::QAR(A)+P(B),XB(a)
      • P(b);OGATEB::QAB(A)
      • P(c);OGATEB::QAB(A)
      • R(f);OGATE::QAR(A)+P(B),XR(f)
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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).