MESON Chess Problem Database

Problem Display
PID: 97940 (B6B/1Np2K2/1p6/3k4/1p2Np2/1P2p3/2q2p2/5Q2 w - - 0 1)

Hermanson, Halvar

Problem (Zagreb), 1953

B6B/1Np2K2/1p6/3k4/1p2Np2/1P2p3/2q2p2/5Q2

#2

7 + 8

6490 yacpdb 2009
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe4
      • 2.Sd6#
    • 1...Kc6
      • 2.Sbc5#
    • 1...Qb1
      • 2.Qc4#
    • 1...Qd1
      • 2.Qc4#
    • 1...Qa2
      • 2.Qc4#
    • 1...Qb2
      • 2.Qc4#
    • 1...Qd2
      • 2.Qc4#
    • 1...Qc4
      • 2.Qxc4#
    • 1...Qc6
      • 2.Qd3#
    • 1...c5
      • 2.Sa5#
      • 2.Sbxc5#
      • 2.Sbd6#
      • 2.Sd8#
  • Tries
    • 1.Sc3+?
      • 1...Kc6
        • 2.Qb5#
      • 1...bxc3
        • 2.Qc4#
      • 1...Qxc3!
    • 1.Sa5+?
      • 1...Qc6
        • 2.Bxc6#
        • 2.Qd3#
        • 2.Qc4#
      • 1...c6!
    • 1.Sbd6+?
      • 1...Qc6
        • 2.Qd3#
        • 2.Qc4#
        • 2.Qb5#
        • 2.Qd1#
      • 1...c6!
    • 1.Sd8+?
      • 1...Qc6
        • 2.Bxc6#
        • 2.Qd3#
        • 2.Qc4#
      • 1...c6!
    • 1.Qd3+?
      • 1...Kc6
        • 2.Sa5#
        • 2.Sbc5#
        • 2.Sd8#
      • 1...Qxd3!
    • 1.Qb5+?
      • 1...Kxe4
        • 2.Sd6#
      • 1...c5
        • 2.Sa5#
        • 2.Sbxc5#
        • 2.Sbd6#
        • 2.Sd8#
      • 1...Qc5!
  • Keys
    • 1.Qh3!
      • threat
        • 2.Qe6#
      • 1...Kxe4
        • 2.Sc5#
      • 1...Kc6
        • 2.Sbd6#
      • 1...Qxe4
        • 2.Qd7#
      • 1...Qc6
        • 2.Qf5#

Anticipated by 61184(1942)

This anticipates 245799(1993), 86159(2001)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • K(f);S_FLIGHT,XS(C)::B(F)+S(D),DCHECK
    • K(f);S_FLIGHT::B(F)+S(D)
    • Q(a);N_GUARD::QAB1(A)
    • Q(a);N_GUARD::QAB1(A),XQ(a)
    • Q(a);N_GUARD,SBLOCK::QAR2(A)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(f);S_FLIGHT::QAB1(A)
        • P(d);XS(C)::QAB1(A)
      • Refutation
        • Q(a);XS(C)
    • Try
      • S(D);CHECK
      • Refutation
        • P(h);P_SPINP(h)
    • Try
      • S(D);CHECK
      • Refutation
        • P(h);P_SPINP(h)
    • Try
      • S(D);CHECK
      • Refutation
        • P(h);P_SPINP(h)
    • Try
      • Q(A);CHECK
      • Refutation
        • Q(a);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(f);S_FLIGHT,XS(C)::B(F)+S(D),DCHECK
      • Refutation
        • Q(a);P_SPINQ(a)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • K(f);S_FLIGHT,XS(C)::B(F)+S(D),DCHECK
      • K(f);S_FLIGHT::B(F)+S(D)
      • Q(a);SBLOCK,XS(C)::QAR2(A)
      • Q(a);SBLOCK::QAR2(A)
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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).