MESON Chess Problem Database

Problem Display
PID: 59792 (8/7p/4RK1k/7r/5p2/7Q/8/8 w - - 0 1)

Lincoln, Robert A

5th Prize, Amirov MT, 2002

8/7p/4RK1k/7r/5p2/7Q/8/8

#2

3 + 4

145 StrateGems 2005

SOLUTION

  • SOUND
  • Sets
    • 1...Rh4
      • 2.Qxh4#
  • Tries
    • 1.Re5?
      • threat
        • 2.Rxh5#
        • 2.Qxh5#
      • 1...Rh4
        • 2.Qxh4#
      • 1...Rxh3!
    • 1.Qf5?
      • threat
        • 2.Kf7#
      • 1...Rg5
        • 2.Qxg5#
      • 1...Rxf5+!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Ke7#
        • 2.Kf7#
        • 2.Qg7#
      • 1...Rf5+
        • 2.Kxf5#
      • 1...Rh1
        • 2.Ke5#
        • 2.Kf5#
        • 2.Ke7#
        • 2.Kf7#
        • 2.Qg5#
      • 1...Rh2
        • 2.Ke5#
        • 2.Kf5#
        • 2.Ke7#
        • 2.Kf7#
        • 2.Qg5#
      • 1...Rh3
        • 2.Ke5#
        • 2.Kf5#
        • 2.Ke7#
        • 2.Kf7#
        • 2.Qxh3#
        • 2.Qg5#
      • 1...Rh4
        • 2.Ke5#
        • 2.Kf5#
        • 2.Ke7#
        • 2.Kf7#
        • 2.Qxh4#
        • 2.Qg5#
      • 1...Ra5
        • 2.Ke7#
        • 2.Kf7#
      • 1...Rb5
        • 2.Ke7#
        • 2.Kf7#
      • 1...Rc5
        • 2.Ke7#
        • 2.Kf7#
      • 1...Rd5
        • 2.Ke7#
        • 2.Kf7#
      • 1...Re5
        • 2.Kxe5#
      • 1...Rg5
        • 2.Qxg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(b);OGATEB::QAR2(A),XR(b)
  • Tries
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);OGATEB::QAR2(A),XR(b)
      • Refutation
        • R(b);N_SPINR(b),XQ(A)
    • Try
      • Q(A);N_PINR(b)
      • Threat
        • R(B)+K(C)
      • Vars
        • R(b);N_GUARD::QAB1(A),XR(b)
      • Refutation
        • R(b);CHECK,XQ(A)
  • Actual
    • Q(A);N_PINR(b)
    • Threat
      • DUALS(3)
    • Vars
      • R(b);CHECK::R(B)+K(C),XR(b)
      • R(b);::R(B)+K(C),XR(b)
      • R(b);N_GUARD::QAB1(A),XR(b)
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).