MESON Chess Problem Database

Problem Display
PID: 249906 (8/7q/b2rrp1p/1p6/p2PkP2/7B/Q1NR1RN1/1K2n3 w - - 0 1)

Popp, Willy

2nd Comm., Deutsche Schachzeitung, 1967

8/7q/b2rrp1p/1p6/p2PkP2/7B/Q1NR1RN1/1K2n3

#2

9 + 10

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd4
      • 2.Rxd4#
      • 2.Qxe6#
    • 1...Rd7
      • 2.Qxe6#
    • 1...Rd8
      • 2.Qxe6#
    • 1...Sd3
      • 2.Rde2#
    • 1...Sf3
      • 2.Rfe2#
  • Tries
    • 1.d5?
      • threat
        • 2.Rd4#
      • 1...Rxd5
        • 2.Qxd5#
      • 1...Sxc2
        • 2.Qxc2#
      • 1...Sd3
        • 2.Rde2#
      • 1...Sf3
        • 2.Rfe2#
      • 1...Qa7!
  • Keys
    • 1.f5!
      • threat
        • 2.Rf4#
      • 1...Qxf5
        • 2.Bxf5#
      • 1...Rxd4
        • 2.Qxe6#
      • 1...Sxg2
        • 2.Bxg2#
      • 1...Sd3
        • 2.Rde2#
      • 1...Sf3
        • 2.Rfe2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • R(f);N_GUARD::QAR2(B),XR(g)
    • S(a);SBLOCK::R(D)
    • S(a);SBLOCK::R(E)
  • Tries
    • Try
      • P(H);
      • Threat
        • R1(D)
      • Vars
        • R(f);OGATE,XP(H)::QAB1(B),XR(f)
        • S(a);OGATE,XS(C)::QAB(B),XS(a)
        • S(a);SBLOCK::R(D)
        • S(a);SBLOCK::R(E)
      • Refutation
        • Q(j);
  • Actual
    • P(I);
    • Threat
      • R1(E)
    • Vars
      • Q(j);OGATE,XP(I)::B(G),XQ(j)
      • R(f);N_GUARD,XP(H)::QAR2(B),XR(g)
      • S(a);OGATE,XS(F)::B(G),XS(a)
      • S(a);SBLOCK::R(D)
      • S(a);SBLOCK::R(E)
HTML5 logo

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).