MESON Chess Problem Database

Problem Display
PID: 249147 (8/8/8/2K5/k1N5/p7/n1P5/R7 w - - 0 1)

Lewis, Robert Tony

The Problemist, 1990

8/8/8/2K5/k1N5/p7/n1P5/R7

#2

4 + 3

3713 Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sc1
      • 2.Rxa3#
    • 1...Sc3
      • 2.Rxa3#
    • 1...Sb4
      • 2.Rxa3#
  • Tries
    • 1.Sb2+?
      • 1...axb2
        • 2.Rxa2#
      • 1...Ka5!
    • 1.c3?
      • 1...Sxc3
        • 2.Rxa3#
      • 1...Sc1
        • 2.Rxa3#
      • 1...Sb4
        • 2.Rxa3#
      • 1...Kb3!
  • Keys
    • 1.Rb1!
      • 1...Sc1
        • 2.Rb4#
      • 1...Sc3
        • 2.Rb4#
      • 1...Sb4
        • 2.Rxb4#

Anticipated by 242060(1936)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(a);OGATE,P_SPINP(b)::R1(A),XP(b)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • P(b);P_SPINS(a),XS(C)::R(A),XS(a)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • P(B);
      • Vars
        • S(a);OGATE,P_SPINP(b),XP(B)::R1(A),XP(b)
        • S(a);OGATE,P_SPINP(b)::R1(A),XP(b)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • R(A);
    • Vars
      • S(a);N_GUARD::R1(A)
      • S(a);N_GUARD::R1(A),XS(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).