MESON Chess Problem Database

Problem Display
PID: 93277 (2Q2Rb1/6k1/6P1/7K/4n3/8/8/8 w - - 0 1)

Zilahi, Zoltan

Skakbladet, 1961

2Q2Rb1/6k1/6P1/7K/4n3/8/8/8

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kh8
      • 2.Rxg8#
    • 1...Bf7
      • 2.Rxf7#
    • 1...Bh7
      • 2.Rf7#
  • Tries
    • 1.Rf7+?
      • 1...Kh8
        • 2.Rh7#
      • 1...Bxf7!
    • 1.Qb7+?
      • 1...Kh8
        • 2.Qh7#
      • 1...Bf7
        • 2.Qxf7#
      • 1...Kxf8!
    • 1.Qc7+?
      • 1...Kh8
        • 2.Qh7#
      • 1...Bf7
        • 2.Qxf7#
      • 1...Kxf8!
  • Keys
    • 1.Qd7+!
      • 1...Kxf8
        • 2.g7#
      • 1...Kh8
        • 2.Qh7#
      • 1...Bf7
        • 2.Qxf7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(b);P_SPINB(c),S_FLIGHT::R1(D),XB(c)
    • B(c);N_GUARD,P_PINP(B)::R1(D),XB(c)
    • B(c);N_GUARD::R1(D)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(b);OGATE,P_SPINB(c),S_FLIGHT::R1(D)
      • Refutation
        • B(c);P_PINP(B),XR(D)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,P_SPINB(c),S_FLIGHT::QAR1(C)
        • B(c);N_GUARD,P_PINP(B),P_SPINB(c)::QAR1(C),XB(c)
      • Refutation
        • K(b);S_FLIGHT,XR(D)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,P_SPINB(c),S_FLIGHT::QAR1(C)
        • B(c);N_GUARD,P_PINP(B),P_SPINB(c)::QAR1(C),XB(c)
      • Refutation
        • K(b);S_FLIGHT,XR(D)
  • Actual
    • Q(C);CHECK
    • Vars
      • K(b);OGATE,S_FLIGHT,XR(D)::P(B)
      • K(b);OGATE,P_SPINB(c),S_FLIGHT::QAR1(C)
      • B(c);N_GUARD,P_PINP(B),P_SPINB(c)::QAR1(C),XB(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).