MESON Chess Problem Database

Problem Display
PID: 232752 (4Q3/3pbp2/4p3/8/1R1Pk3/4N3/4K1N1/7b w - - 0 1)

Harder, Karl

Freie Presse, 1976

4Q3/3pbp2/4p3/8/1R1Pk3/4N3/4K1N1/7b

#2

6 + 6

5454 Near Snap 2021
15148 Sadier Collection 2021
3713 Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bd6
      • 2.Qa8#
  • Tries
    • 1.Qxf7?
      • threat
        • 2.Qg6#
        • 2.Qf3#
        • 2.Qf4#
        • 2.Qh7#
      • 1...Bxb4
        • 2.Qf4#
      • 1...Bg5
        • 2.Qg6#
        • 2.Qf3#
        • 2.Qh7#
      • 1...Bd6
        • 2.Qg6#
        • 2.Qf3#
        • 2.Qh7#
      • 1...Bf6
        • 2.Qg6#
        • 2.Qh7#
      • 1...e5
        • 2.Qd5#
        • 2.Qg6#
        • 2.Qf3#
        • 2.Qf5#
        • 2.Qh7#
      • 1...Bxg2!
    • 1.Qb8?
      • threat
        • 2.Qf4#
        • 2.Qe5#
      • 1...Bxg2
        • 2.Qe5#
      • 1...Bg5
        • 2.Qe5#
        • 2.d5#
      • 1...Bd6
        • 2.Qb7#
        • 2.Qa8#
      • 1...Bf6
        • 2.Qf4#
      • 1...e5
        • 2.Qxe5#
      • 1...f6
        • 2.Qf4#
      • 1...d6!
  • Keys
    • 1.Qh8!
      • threat
        • 2.Qe5#
      • 1...Bd6
        • 2.Qa8#
      • 1...Bf6
        • 2.Qh7#
      • 1...e5
        • 2.Qxe5#
      • 1...d6
        • 2.d5#
      • 1...f6
        • 2.Qh4#

Anticipated by 9374(1901), 227504(1926), 248090(1944)

This anticipates 205470(2017)

FEATURES

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