MESON Chess Problem Database

Problem Display
PID: 139044 (6B1/3p1p2/1n1pn3/1P1k4/1K6/2Q2P2/6R1/8 w - - 0 1)

Pickering, S

The Problemist, 1937

6B1/3p1p2/1n1pn3/1P1k4/1K6/2Q2P2/6R1/8

#2

6 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...f5
      • 2.Rd2#
    • 1...f6
      • 2.Rd2#
  • Tries
    • 1.Rg5+?
      • 1...f5
        • 2.Rxf5#
      • 1...Sxg5!
    • 1.Qe1?
      • threat
        • 2.Qe4#
      • 1...Kd4
        • 2.Rd2#
        • 2.Qe4#
      • 1...Sg5
        • 2.Rd2#
      • 1...f5
        • 2.Rd2#
      • 1...Sc5!
    • 1.Qd3+?
      • 1...Sd4
        • 2.Qe4#
      • 1...Ke5!
  • Keys
    • 1.Qe3!
      • threat
        • 2.Qe4#
      • 1...Sc5
        • 2.Rg5#
      • 1...Sg5
        • 2.Rd2#
        • 2.Rxg5#
      • 1...f5
        • 2.Rd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • P(f);P_SPINS(d)::R(A)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • P(f);P_SPINP(f),P_SPINS(d)::R(A),XP(f)
      • Refutation
        • S(d);P_SPINP(f),XR(A)
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • S(d);N_GUARD,P_SPINP(f)::R(A)
        • P(f);P_SPINS(d)::R(A)
      • Refutation
        • S(d);P_SPINP(f)
    • Try
      • Q(B);CHECK
      • Vars
        • S(d);P_SPINP(f),P_SPINS(d)::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • S(d);N_GUARD,P_SPINP(f)::R(A)
      • P(f);P_SPINS(d)::R(A)
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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).