MESON Chess Problem Database

Problem Display
PID: 227692 (6N1/8/8/4pk1K/2Q5/4P2b/8/8 w - - 0 1)

Schiffert, Gyorgy

Magyar Sakkvilag, 1926

6N1/8/8/4pk1K/2Q5/4P2b/8/8

#2

4 + 3

6490 yacpdb 2020
5454 Near Snap 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Bf1
      • 2.Qg4#
    • 1...Bg2
      • 2.Qg4#
    • 1...Bg4+
      • 2.Qxg4#
    • 1...e4
      • 2.Qd5#
  • Tries
    • 1.Qd3+?
      • 1...e4
        • 2.Qd5#
      • 1...Ke6!
    • 1.Qh4?
      • 1...Bg4+
        • 2.Qxg4#
      • 1...e4
        • 2.Qf6#
      • 1...Bf1
        • 2.Qg4#
      • 1...Bg2
        • 2.Qg4#
      • 1...Ke6!
    • 1.Qc6?
      • threat
        • 2.Sh6#
        • 2.Se7#
        • 2.Qg6#
      • 1...e4
        • 2.Qd5#
        • 2.Qf6#
      • 1...Bg4+!
  • Keys
    • 1.Sh6+!
      • 1...Kf6
        • 2.Qf7#

Anticipated by 167307(1886)

This anticipates 39648(1933)

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • B(a);N_GUARD::QAB1(B)
    • B(a);CHECK,N_GUARD::QAB1(B),XB(a)
    • P(b);OGATEB::QAR2(B)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • P(b);OGATEB,P_SPINP(b)::QAR2(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • B(a);CHECK,N_GUARD::QAB1(B),XB(a)
        • P(b);SBLOCK::QAR1(B)
        • B(a);N_GUARD::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);
      • Threat
        • DUALS(3)
      • Refutation
        • B(a);CHECK
  • Actual
    • S(D);CHECK
    • Vars
      • K(c);P-FLIGHT::QAR1(B)
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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).