MESON Chess Problem Database

Problem Display
PID: 57869 (4N3/1n6/2p5/2kP4/1R6/K1p2b2/2Q5/2n5 w - - 0 1)

Hermanson, Halvar

Chess Life, 1958

4N3/1n6/2p5/2kP4/1R6/K1p2b2/2Q5/2n5

#2

5 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd5
      • 2.Qf5#
    • 1...Bxd5
      • 2.Qf2#
    • 1...cxd5
      • 2.Qxc3#
  • Tries
    • 1.Qd3?
      • threat
        • 2.Qc4#
        • 2.Qd4#
      • 1...Bxd5
        • 2.Qe3#
        • 2.Qd4#
      • 1...cxd5
        • 2.Qb5#
        • 2.Qxc3#
      • 1...Be2
        • 2.Qd4#
      • 1...Se2
        • 2.Qc4#
      • 1...Sb3
        • 2.Qc4#
      • 1...Sa5
        • 2.Qd4#
      • 1...Sd6
        • 2.Qd4#
      • 1...Sxd3!
    • 1.Qa4?
      • threat
        • 2.Qxc6#
      • 1...Bxd5
        • 2.Qa7#
      • 1...cxd5
        • 2.Qb5#
      • 1...Sa5
        • 2.Qxa5#
      • 1...Sd8
        • 2.Qa5#
      • 1...Kxd5!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Qxc6#
      • 1...Kxd5
        • 2.Qf5#
      • 1...Bxd5
        • 2.Qg1#
      • 1...cxd5
        • 2.Qb6#
      • 1...Sa5
        • 2.Qd6#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Sd8
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(d);N_SPINP(b),OGATEB,P-FLIGHT,XP(D)::QAR2(A)
    • B(c);SBLOCK,XP(D)::QAB(A)
    • P(e);SBLOCK,XP(D)::QAR2(A),XP(b)
  • Tries
    • Try
      • Q(A);N_PINP(b)
      • Threat
        • DUALS(2)
      • Vars
        • B(c);::QAB1(A)
        • S(a);::QAR1(A)
        • S(f);::QAB1(A)
      • Refutation
        • S(a);XQ(A)
    • Try
      • Q(A);N_PINP(b)
      • Threat
        • QAR1(A),XP(e)
      • Vars
        • B(c);SBLOCK,XP(D)::QAB(A)
        • P(e);N_GUARD,SBLOCK,XP(D)::QAR1(A)
        • S(f);N_GUARD::QAR2(A),XS(f)
        • S(f);N_GUARD::QAR2(A)
      • Refutation
        • K(d);P-FLIGHT,XP(D)
  • Actual
    • Q(A);N_PINP(b)
    • Threat
      • QAR1(A),XP(e)
    • Vars
      • K(d);OGATEB,P-FLIGHT,XP(D)::QAR2(A)
      • B(c);SBLOCK,XP(D)::QAB(A)
      • P(e);OGATE,SBLOCK,XP(D)::QAB1(A)
      • S(f);N_GUARD::QAB1(A)
      • S(f);N_GUARD::QAB1(A),XS(f)
HTML5 logo

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).