MESON Chess Problem Database

Problem Display
PID: 233753 (3K4/8/1pp5/bP3R2/2kpn3/2rNpQ2/2nPPp1p/1R1B4 w - - 0 1)

Popp, Willy

Freie Presse, 1969

3K4/8/1pp5/bP3R2/2kpn3/2rNpQ2/2nPPp1p/1R1B4

#2

9 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.Sb2#
    • 1...Sxd2
      • 2.Qxc6#
    • 1...Sg3
      • 2.Qxc6#
    • 1...Sc5
      • 2.Se5#
    • 1...Sg5
      • 2.Qxc6#
    • 1...Sd6
      • 2.Qxc6#
    • 1...Sf6
      • 2.Qxc6#
  • Tries
    • 1.Rb4+?
      • 1...Sxb4
        • 2.Sb2#
      • 1...Bxb4!
    • 1.Rc5+?
      • 1...Sxc5
        • 2.Se5#
      • 1...bxc5+!
  • Keys
    • 1.Qg2!
      • threat
        • 2.Qg8#
      • 1...Sb4
        • 2.Sb2#
      • 1...Sg3
        • 2.Qxc6#
      • 1...Sc5
        • 2.Se5#
      • 1...Sg5
        • 2.Qxc6#
      • 1...Sd6
        • 2.Qxc6#
      • 1...Sf6
        • 2.Qxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • S(a);SBLOCK::S(E)
    • S(h);OGATE,XP(C)::QAR2(F),XP(k)
    • S(h);OGATE::QAR2(F),XP(k)
    • S(h);SBLOCK::S(E)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • S(a);SBLOCK,XR(A)::S(E)
      • Refutation
        • B(i);XR(A)
    • Try
      • R(H);CHECK
      • Vars
        • S(h);SBLOCK,XR(H)::S(E)
      • Refutation
        • P(j);CHECK,XR(H)
  • Actual
    • Q(F);
    • Threat
      • QAB(F)
    • Vars
      • S(a);SBLOCK::S(E)
      • S(h);OGATE::QAR2(F),XP(k)
      • S(h);SBLOCK::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).