MESON Chess Problem Database

Problem Display
PID: 248090 (3Q4/2pbp3/3p4/8/3kP1R1/3N4/1N1K4/b7 w - - 0 1)

Blikeng, Bjarne

Magasinet for Alle, 1944

3Q4/2pbp3/3p4/8/3kP1R1/3N4/1N1K4/b7

#2

6 + 6

15601 Albrecht-Leiss-Degener Collection 2021
5454 Near Snap 2021
3713 Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Be6
      • 2.Qh8#
  • Tries
    • 1.Qxc7?
      • threat
        • 2.Qb6#
        • 2.Qc3#
        • 2.Qc4#
        • 2.Qa7#
      • 1...Bxg4
        • 2.Qc4#
      • 1...Bb5
        • 2.Qb6#
        • 2.Qc3#
        • 2.Qa7#
      • 1...Bc6
        • 2.Qb6#
        • 2.Qa7#
      • 1...Be6
        • 2.Qb6#
        • 2.Qc3#
        • 2.Qa7#
      • 1...d5
        • 2.Qe5#
        • 2.Qb6#
        • 2.Qc3#
        • 2.Qc5#
        • 2.Qa7#
      • 1...Bxb2!
    • 1.Qg8?
      • threat
        • 2.Qc4#
        • 2.Qd5#
      • 1...Bxb2
        • 2.Qd5#
      • 1...Bb5
        • 2.Qd5#
        • 2.e5#
      • 1...Bc6
        • 2.Qc4#
      • 1...Be6
        • 2.Qg7#
        • 2.Qh8#
      • 1...d5
        • 2.Qxd5#
      • 1...c6
        • 2.Qc4#
      • 1...e6!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Qd5#
      • 1...Bc6
        • 2.Qa7#
      • 1...Be6
        • 2.Qh8#
      • 1...d5
        • 2.Qxd5#
      • 1...c6
        • 2.Qa4#
      • 1...e6
        • 2.e5#

Anticipated by 9374(1901), 227504(1926)

This anticipates 232752(1976), 205470(2017)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(e);P_SPINP(c),S_CUTP(f)::QAB(F)
  • Tries
    • Try
      • Q(F);XP(d)
      • Threat
        • DUALS(4)
      • Vars
        • B(e);XR(E)::QAR1(F)
      • Refutation
        • B(a);XS(A)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);XS(A)::QAR1(F)
        • B(e);::QAR1(F)
        • P(c);::QAR1(F),XP(c)
        • P(d);::QAR1(F)
      • Refutation
        • P(f);
  • Actual
    • Q(F);
    • Threat
      • QAR1(F)
    • Vars
      • B(e);S_CUTP(d)::QAB(F)
      • B(e);S_CUTP(f)::QAB(F)
      • P(c);::QAR1(F),XP(c)
      • P(d);S_CUTB(e)::QAR(F)
      • P(f);S_CUTB(e)::R(E)+P(D)
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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).