MESON Chess Problem Database

Problem Display
PID: 195808 (8/4b3/8/7K/6P1/4Q1rk/4R3/8 w - - 0 1)

Lincoln, Robert A

Comm., Problemist Ukraini TT, 2017

8/4b3/8/7K/6P1/4Q1rk/4R3/8

#2

4 + 3

145 StrateGems 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rf3
      • 2.Qxf3#
  • Tries
    • 1.Qg1?
      • threat
        • 2.Rh2#
        • 2.Qh2#
        • 2.Qh1#
      • 1...Rxg4
        • 2.Rh2#
        • 2.Qh2#
        • 2.Qxg4#
      • 1...Rg2
        • 2.Qxg2#
      • 1...Ra3
        • 2.Rh2#
        • 2.Qh2#
        • 2.Qg2#
      • 1...Rb3
        • 2.Rh2#
        • 2.Qh2#
        • 2.Qg2#
      • 1...Rc3
        • 2.Rh2#
        • 2.Qh2#
        • 2.Qg2#
      • 1...Rd3
        • 2.Rh2#
        • 2.Qh2#
        • 2.Qg2#
      • 1...Re3
        • 2.Rh2#
        • 2.Rxe3#
        • 2.Qh2#
        • 2.Qxe3#
        • 2.Qg2#
      • 1...Rf3
        • 2.Rh2#
        • 2.Qh2#
        • 2.Qg2#
      • 1...Rxg1!
    • 1.Qe4?
      • threat
        • 2.Qh1#
      • 1...Rxg4
        • 2.Qxg4#
      • 1...Rg2
        • 2.Qxg2#
      • 1...Ra3
        • 2.Qg2#
      • 1...Rb3
        • 2.Qg2#
      • 1...Rc3
        • 2.Qg2#
      • 1...Rd3
        • 2.Qg2#
        • 2.Qxd3#
      • 1...Re3
        • 2.Qg2#
        • 2.Qxe3#
      • 1...Rf3
        • 2.Qxf3#
      • 1...Rg1!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Qh2#
      • 1...Rg2
        • 2.Qxg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(a);OGATEB::QAR2(B),XR(a)
  • Tries
    • Try
      • Q(B);N_PINR(a)
      • Threat
        • DUALS(3)
      • Vars
        • R(a);N_GUARD::QAB1(B),XR(a)
      • Refutation
        • R(a);XQ(B)
    • Try
      • Q(B);N_PINR(a)
      • Threat
        • QAR2(B)
      • Vars
        • R(a);OGATE,XP(C)::QAB1(B),XR(a)
        • R(a);N_GUARD::QAB1(B),XR(a)
        • R(a);N_GUARD,SBLOCK::QAB1(B)
        • R(a);N_GUARD::QAB1(B)
        • R(a);OGATEB::QAR2(B),XR(a)
      • Refutation
        • R(a);
  • Actual
    • Q(B);N_PINR(a)
    • Threat
      • QAR1(B)
    • Vars
      • R(a);N_GUARD::QAB1(B),XR(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).