MESON Chess Problem Database

Problem Display
PID: 183411 (1k6/N2R4/5p2/K1PB4/pB2p3/r5P1/2Q5/1R2q2b w - - 0 1)

Fenner, A Jack

The Problemist, 1943

1k6/N2R4/5p2/K1PB4/pB2p3/r5P1/2Q5/1R2q2b

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qf2
      • 2.Bxa3#
    • 1...Qxb4+
      • 2.Rxb4#
  • Tries
    • 1.Sc6+?
      • 1...Ka8
        • 2.Ra7#
      • 1...Kc8!
    • 1.Bd2+?
      • 1...Qxb1
        • 2.Bf4#
      • 1...Rb3!
    • 1.Rd8+?
      • 1...Kxa7
        • 2.Ra8#
      • 1...Kc7!
  • Keys
    • 1.Qh2!
      • threat
        • 2.Qh8#
      • 1...Qxb4+
        • 2.Rxb4#
      • 1...Qxg3
        • 2.Bxa3#
      • 1...Rxg3
        • 2.Bxe1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(a);N_PINB(D)::R(A)+B(D),XR(c)
    • Q(a);CHECK,OGATE,P_SPINQ(a),XB(D)::R(A),XQ(a)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • K(g);P-FLIGHT::R1(I)
      • Refutation
        • K(g);P-FLIGHT
    • Try
      • B(D);CHECK
      • Vars
        • Q(a);N_PINB(D),XR(A)::B(D)
      • Refutation
        • R(c);P_SPINR(c)
    • Try
      • R(I);CHECK
      • Vars
        • K(g);OGATE,S_FLIGHT,XS(H)::R1(I)
      • Refutation
        • K(g);S_FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR(B)
    • Vars
      • Q(a);CHECK,OGATE,P_SPINQ(a),XB(D)::R(A),XQ(a)
      • Q(a);N_PINB(D),P_SPINQ(a),XP(C)::R(A)+B(D),XR(c)
      • R(c);N_GUARD,P_SPINR(c),XP(C)::R(A)+B(D),XQ(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).