MESON Chess Problem Database

Problem Display
PID: 234559 (kr6/1R6/p2K4/8/7Q/8/8/7B w - - 0 1)

Speckmann, Werner

Deutsche Schachzeitung, 1971

kr6/1R6/p2K4/8/7Q/8/8/7B

#2

4 + 3

5454 Near Snap 2021
15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rd8+
      • 2.Qxd8#
    • 1...Rh8
      • 2.Qxh8#
  • Tries
    • 1.Qd8?
      • threat
        • 2.Rc7#
        • 2.Rd7#
        • 2.Re7#
        • 2.Rf7#
        • 2.Rg7#
        • 2.Rh7#
        • 2.Qxb8#
      • 1...Rc8
        • 2.Qxc8#
      • 1...Rxd8+!
    • 1.Qh8?
      • threat
        • 2.Rc7#
        • 2.Rd7#
        • 2.Re7#
        • 2.Rf7#
        • 2.Rg7#
        • 2.Rh7#
        • 2.Qxb8#
      • 1...Rd8+
        • 2.Qxd8#
      • 1...Rc8
        • 2.Qxc8#
      • 1...Re8
        • 2.Qxe8#
      • 1...Rf8
        • 2.Qxf8#
      • 1...Rg8
        • 2.Qxg8#
      • 1...Rxh8!
  • Keys
    • 1.Qb4!
      • 1...Rd8+
        • 2.Rd7#
      • 1...Rxb7
        • 2.Qxb7#
      • 1...Rc8
        • 2.Rc7#
      • 1...Re8
        • 2.Re7#
      • 1...Rf8
        • 2.Rf7#
      • 1...Rg8
        • 2.Rg7#
      • 1...Rh8
        • 2.Rh7#
      • 1...a5
        • 2.Qxa5#

Anticipated by 92(1930)

This is a version

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • R(c);CHECK,OGATEB::QAR(B),XR(c)
    • R(c);OGATEB::QAB1(B),XR(c)
  • Tries
    • Try
      • Q(B);P_PINR(c)
      • Threat
        • DUALS(7)
      • Vars
        • R(c);OGATEB::QAR2(B),XR(c)
      • Refutation
        • R(c);CHECK,N_SPINR(c),XQ(B)
    • Try
      • Q(B);P_PINR(c)
      • Threat
        • DUALS(7)
      • Vars
        • R(c);CHECK,OGATEB::QAR(B),XR(c)
        • R(c);OGATEB::QAR2(B),XR(c)
        • R(c);OGATEB::QAR(B),XR(c)
      • Refutation
        • R(c);N_SPINR(c),XQ(B)
  • Actual
    • Q(B);
    • Vars
      • R(c);CHECK,N_GUARD::B(A)+R(D)
      • R(c);OGATE,P_SPINR(c),XR(D)::QAB1(B),XR(c)
      • R(c);N_GUARD::B(A)+R(D)
      • P(a);OGATEB::QAR(B),XP(a)
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).