MESON Chess Problem Database

Problem Display
PID: 23212 (1Kb5/8/1R6/8/k5r1/p7/8/4Q3 w - - 0 1)

Lincoln, Robert A

Fun with Chess Miniatures, 1996

1Kb5/8/1R6/8/k5r1/p7/8/4Q3

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Rg1
      • 2.Qb4#
    • 1...Rg2
      • 2.Qb4#
    • 1...Rg3
      • 2.Qb4#
    • 1...Rb4
      • 2.Qxb4#
    • 1...Rg5
      • 2.Qb4#
    • 1...Rg6
      • 2.Qb4#
    • 1...Rg7
      • 2.Qb4#
    • 1...Rg8
      • 2.Qb4#
  • Tries
    • 1.Rb5?
      • threat
        • 2.Qa5#
      • 1...Rb4
        • 2.Qxb4#
      • 1...Kxb5!
    • 1.Qe8+?
      • 1...Ka5
        • 2.Qb5#
      • 1...Bd7!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Qb5#
      • 1...Ka5
        • 2.Qb5#
      • 1...a2
        • 2.Qxa2#
      • 1...Rb4
        • 2.Qxb4#
      • 1...Rg5
        • 2.Qb4#
      • 1...Ba6
        • 2.Rxa6#
      • 1...Bd7
        • 2.Ra6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • R(c);N_GUARD::QAR1(A)
    • R(c);N_GUARD,P_PINR(B)::QAR1(A),XR(c)
  • Tries
    • Try
      • R(B);
      • Threat
        • QAR1(A)
      • Vars
        • R(c);N_GUARD,P_PINR(B)::QAR1(A),XR(c)
      • Refutation
        • K(b);S_FLIGHT,XR(B)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • B(d);P_SPINB(d)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • K(b);P-FLIGHT::QAR1(A)
      • P(a);OGATEB::QAR2(A),XP(a)
      • R(c);N_GUARD,P_PINR(B)::QAR1(A),XR(c)
      • R(c);N_GUARD::QAR1(A)
      • B(d);N_GUARD::R(B),XB(d)
      • B(d);N_GUARD::R(B)
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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).