MESON Chess Problem Database

Problem Display
PID: 271340 (3R1R2/1N5N/1p2p1pp/1K1PkP2/3pp2P/4n1P1/8/7Q w - - 0 1)

Mochalkin, Oleksandr Viktorovich

Buletin Problemistic, 1992

3R1R2/1N5N/1p2p1pp/1K1PkP2/3pp2P/4n1P1/8/7Q

#2

10 + 8

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...d3
      • 2.Qa1#
    • 1...exd5
      • 2.Rde8#
    • 1...exf5
      • 2.Rfe8#
  • Tries
    • 1.Sf6?
      • threat
        • 2.Qxe4#
      • 1...Kxf5
        • 2.Qxe4#
      • 1...exd5
        • 2.Sd7#
      • 1...exf5
        • 2.Rde8#
      • 1...Sg2
        • 2.Sg4#
      • 1...gxf5!
    • 1.Qc1?
      • threat
        • 2.Qc7#
      • 1...Sxf5
        • 2.Qf4#
      • 1...d3
        • 2.Qb2#
        • 2.Qa1#
        • 2.Qc3#
      • 1...Sc2
        • 2.Qf4#
      • 1...Sc4
        • 2.Qf4#
      • 1...Sxd5!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Qxe4#
      • 1...Kxd5
        • 2.Sc4#
        • 2.Sf7#
        • 2.Qxe4#
      • 1...exd5
        • 2.Rfe8#
      • 1...exf5
        • 2.Sf7#
      • 1...gxf5
        • 2.Sf7#
      • 1...Sg2
        • 2.Sc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • P(b);OGATEB::QAB(A)
    • P(f);OGATEB,SBLOCK,XP(E)::R(I)
    • P(f);OGATEB,SBLOCK,XP(F)::R(J)
  • Tries
    • Try
      • S(H);
      • Threat
        • QAR1(A),XP(c)
      • Vars
        • K(d);P-FLIGHT,XP(F)::QAB1(A),XP(c)
        • P(f);SBLOCK,XP(E)::S(H)
        • P(f);OGATEB,SBLOCK,XP(F)::R(I)
        • S(a);N_GUARD::S(H)
      • Refutation
        • P(g);XP(F)
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • S(a);OGATE,XP(F)::QAB1(A)
        • S(a);OGATE::QAB1(A)
      • Refutation
        • S(a);XP(E)
  • Actual
    • S(G);
    • Threat
      • QAR1(A),XP(c)
    • Vars
      • P(f);OGATEB,SBLOCK,XP(E)::R(J)
      • P(f);SBLOCK,XP(F)::S(G)
      • P(g);SBLOCK,XP(F)::S(G)
      • S(a);N_GUARD::S(G)
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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).