MESON Chess Problem Database

Problem Display
PID: 120983 (2KN1bn1/4k1q1/2B3p1/1N1pp2p/1P5P/8/1P2pR2/6Q1 w - - 0 1)

Parrinello, Mario

3rd Comm., The Problemist, 1989

2KN1bn1/4k1q1/2B3p1/1N1pp2p/1P5P/8/1P2pR2/6Q1

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qh6
      • 2.Rf7#
    • 1...Qh8
      • 2.Rf7#
    • 1...Qf7
      • 2.Rxf7#
  • Tries
    • 1.Rf3?
      • threat
        • 2.Qc5#
        • 2.Qa7#
      • 1...Qf6
        • 2.Qa7#
      • 1...Sf6
        • 2.Qc5#
      • 1...d4!
    • 1.Qg4?
      • threat
        • 2.Qe6#
        • 2.Qd7#
      • 1...Qf6
        • 2.Qd7#
      • 1...Qf7
        • 2.Rxf7#
        • 2.Qd7#
      • 1...Sf6
        • 2.Qe6#
      • 1...hxg4!
    • 1.Qg5+?
      • 1...Sf6
        • 2.Qxe5#
      • 1...Qf6!
  • Keys
    • 1.Rf6!
      • threat
        • 2.Re6#
      • 1...Kxf6
        • 2.Qg5#
      • 1...Qxf6
        • 2.Qa7#
      • 1...Sxf6
        • 2.Qc5#
      • 1...Qf7
        • 2.Rxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(g);N_GUARD::R1(C)
    • Q(g);N_GUARD::R1(C),XQ(g)
  • Tries
    • Try
      • R(C);
      • Threat
        • DUALS(2)
      • Vars
        • Q(g);::QAR(A)
        • S(i);::QAB(A)
      • Refutation
        • P(b);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • Q(g);::QAR1(A)
        • S(i);::QAR1(A)
      • Refutation
        • P(d);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • S(i);P_SPINS(i),S_CUTQ(g)::QAR2(A),XP(c)
      • Refutation
        • Q(g);P_SPINQ(g)
  • Actual
    • R(C);
    • Threat
      • R1(C)
    • Vars
      • K(f);OGATEB,S_FLIGHT,XR(C)::QAB1(A)
      • Q(g);SBLOCK,XR(C)::QAR(A)
      • S(i);SBLOCK,XR(C)::QAB(A)
      • Q(g);N_GUARD::R1(C),XQ(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).