MESON Chess Problem Database

Problem Display
PID: 276806 (2R5/1r2pN1b/8/8/Rp2k3/1B1N3Q/8/1K6 w - - 0 1)

Sonnenfeld, Felix Alexander

To Mat, 1956

2R5/1r2pN1b/8/8/Rp2k3/1B1N3Q/8/1K6

#2

7 + 5

15601 Albrecht-Leiss-Degener Collection 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Ra7
      • 2.Rxb4#
  • Tries
    • 1.Qe3+?
      • 1...Kf5
        • 2.Qe6#
      • 1...Kxe3!
    • 1.Qf3+?
      • 1...Kd4
        • 2.Rc4#
      • 1...Kxf3!
  • Keys
    • 1.Sxb4!
      • threat
        • 2.Rc4#
      • 1...Kd4+
        • 2.Sc2#
      • 1...Kf4+
        • 2.Sd3#
      • 1...Rxb4
        • 2.Rxb4#
      • 1...Rc7
        • 2.Sc6#
      • 1...Rd7
        • 2.Sd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • R(c);N_GUARD::R(E),XP(a)
  • Tries
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);N_SPINP(a),OGATE,S_FLIGHT::QAB1(D)
      • Refutation
        • K(b);N_SPINP(a),P-FLIGHT,P_PINS(C),XQ(D)
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);N_GUARD,P-FLIGHT,P_PINS(C)::R1(G)
      • Refutation
        • K(b);N_SPINP(a),P_PINS(C),S_FLIGHT,XQ(D)
  • Actual
    • S(C);XP(a)
    • Threat
      • R(G)
    • Vars
      • K(b);CHECK,P-FLIGHT::R(E)+S(C),DCHECK
      • R(c);OGATE,P_PINB(B),P_SPINR(c),XS(C)::R(E),XR(c)
      • R(c);N_GUARD::R(E)+S(C)
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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).