MESON Chess Problem Database

Problem Display
PID: 193956 (2NkN3/3b4/3Q4/8/6p1/6K1/8/8 w - - 0 1)

Hoeg, Nils

Horsens Avis, 1916

2NkN3/3b4/3Q4/8/6p1/6K1/8/8

#2

4 + 3

5454 Near Snap 2019
3713 Snap 2019
6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc8
      • 2.Qc7#
    • 1...Kxe8
      • 2.Qe7#
  • Tries
    • 1.Kf2?
      • 1...Kxc8
        • 2.Qc7#
      • 1...Kxe8
        • 2.Qe7#
      • 1...g3+!
    • 1.Kg2?
      • 1...Kxc8
        • 2.Qc7#
      • 1...Kxe8
        • 2.Qe7#
      • 1...g3!
    • 1.Kh2?
      • 1...Kxc8
        • 2.Qc7#
      • 1...Kxe8
        • 2.Qe7#
      • 1...g3+!
    • 1.Kf4?
      • 1...Kxc8
        • 2.Qc7#
      • 1...Kxe8
        • 2.Qe7#
      • 1...g3!
    • 1.Kh4?
      • 1...Kxc8
        • 2.Qc7#
      • 1...Kxe8
        • 2.Qe7#
      • 1...g3!
    • 1.Qb6+?
      • 1...Kxc8
        • 2.Sd6#
        • 2.Qc7#
      • 1...Kxe8!
    • 1.Qf6+?
      • 1...Kxe8
        • 2.Sd6#
        • 2.Qe7#
      • 1...Kxc8!
  • Keys
    • 1.Qd5!
      • 1...Kxc8
        • 2.Qa8#
      • 1...Kxe8
        • 2.Qg8#

Anticipated by 206996(1859), 222837(1884)

This anticipates 21141(1917), 71194(1917), 76800(1945), 142699(1954), 105209(1958), 138156(1962), 217452(1992)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(c);N_SPINB(b),P-FLIGHT,XS(C)::QAR1(B)
    • K(c);N_SPINB(b),P-FLIGHT,XS(D)::QAR1(B)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Vars
        • K(c);N_SPINB(b),P-FLIGHT,XS(C)::QAR1(B)
        • K(c);N_SPINB(b),P-FLIGHT,XS(D)::QAR1(B)
      • Refutation
        • P(a);CHECK
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(c);N_SPINB(b),P-FLIGHT,XS(C)::QAR1(B)
        • K(c);N_SPINB(b),P-FLIGHT,XS(D)::QAR1(B)
      • Refutation
        • P(a);
    • Try
      • K(A);S_FLIGHT
      • Vars
        • K(c);N_SPINB(b),P-FLIGHT,XS(C)::QAR1(B)
        • K(c);N_SPINB(b),P-FLIGHT,XS(D)::QAR1(B)
      • Refutation
        • P(a);CHECK
    • Try
      • K(A);S_FLIGHT
      • Vars
        • K(c);N_SPINB(b),P-FLIGHT,XS(C)::QAR1(B)
        • K(c);N_SPINB(b),P-FLIGHT,XS(D)::QAR1(B)
      • Refutation
        • P(a);
    • Try
      • K(A);S_FLIGHT
      • Vars
        • K(c);N_SPINB(b),P-FLIGHT,XS(C)::QAR1(B)
        • K(c);N_SPINB(b),P-FLIGHT,XS(D)::QAR1(B)
      • Refutation
        • P(a);
    • Try
      • Q(B);CHECK,N_PINB(b)
      • Refutation
        • K(c);P-FLIGHT,XS(D)
    • Try
      • Q(B);CHECK,N_PINB(b)
      • Refutation
        • K(c);P-FLIGHT,XS(C)
  • Actual
    • Q(B);
    • Vars
      • K(c);N_SPINB(b),OGATEB,P-FLIGHT,XS(C)::QAR2(B)
      • K(c);N_SPINB(b),OGATEB,P-FLIGHT,XS(D)::QAR2(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).