MESON Chess Problem Database

Problem Display
PID: 231192 (2nK3Q/8/8/2p2N2/5k2/4N3/4Pb2/B7 w - - 0 1)

Kallgren, Gustav Henry

Schackvarlden, 1927

2nK3Q/8/8/2p2N2/5k2/4N3/4Pb2/B7

#2

6 + 4

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Qe5#
    • 1...Kg5
      • 2.Qh6#
    • 1...Bg1
      • 2.Qh4#
    • 1...Bh4+
      • 2.Qxh4#
  • Tries
    • 1.Be5+?
      • 1...Kg5
        • 2.Qh6#
      • 1...Ke4!
    • 1.Qd4+?
      • 1...Kg5
        • 2.Qg4#
      • 1...cxd4!
    • 1.Qh2+?
      • 1...Ke4
        • 2.Qe5#
      • 1...Kg5
        • 2.Qh6#
      • 1...Bg3!
    • 1.Qh3?
      • threat
        • 2.Qg4#
      • 1...Bh4+
        • 2.Qxh4#
      • 1...Ke4
        • 2.Qg4#
        • 2.Qf3#
      • 1...Kg5
        • 2.Qg4#
        • 2.Qh6#
      • 1...Bxe3!
    • 1.Qh5?
      • threat
        • 2.Qg4#
      • 1...Bh4+
        • 2.Qxh4#
      • 1...Ke4
        • 2.Qf3#
        • 2.Qg4#
      • 1...Bxe3!
  • Keys
    • 1.Sg3!
      • threat
        • 2.Qe5#
      • 1...Kxe3
        • 2.Qh6#
      • 1...Kxg3
        • 2.Be5#
      • 1...Kg5
        • 2.Qf6#
      • 1...Bxe3
        • 2.Qh4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • K(b);P-FLIGHT::QAR1(F)
    • K(b);S_FLIGHT::QAB1(F)
    • B(a);N_GUARD::QAR2(F)
    • B(a);CHECK,N_GUARD::QAR2(F),XB(a)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(F)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR1(F)
      • Refutation
        • P(c);XQ(F)
    • Try
      • Q(F);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT::QAR1(F)
        • K(b);S_FLIGHT::QAB1(F)
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • Q(F);
      • Threat
        • QAR1(F)
      • Vars
        • B(a);CHECK,N_GUARD::QAR2(F),XB(a)
      • Refutation
        • B(a);XS(C)
    • Try
      • Q(F);
      • Threat
        • QAR1(F)
      • Vars
        • B(a);CHECK,N_GUARD::QAR2(F),XB(a)
      • Refutation
        • B(a);XS(C)
  • Actual
    • S(D);
    • Threat
      • QAB1(F)
    • Vars
      • K(b);S_FLIGHT,XS(C)::QAB(F)
      • K(b);S_FLIGHT,XS(D)::B(A)
      • K(b);S_FLIGHT::QAB1(F)
      • B(a);SBLOCK,XS(C)::QAR2(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).