MESON Chess Problem Database

Problem Display
PID: 223406 (8/p5Q1/p2N4/P1P1P2p/3k3p/P6N/B1P5/3K4 w - - 0 1)

Keller, Charles

New York Tid-Bits, 1886

8/p5Q1/p2N4/P1P1P2p/3k3p/P6N/B1P5/3K4

#2

10 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.e6#
  • Tries
    • 1.Qf6?
      • 1...Kc3
        • 2.e6#
      • 1...Ke3
        • 2.Qf2#
        • 2.Qf4#
      • 1...Kxc5!
    • 1.Qg1+?
      • 1...Kxe5
        • 2.Qg7#
      • 1...Kc3!
    • 1.Qg2?
      • 1...Ke3
        • 2.Sf5#
        • 2.Qe4#
        • 2.Qf2#
      • 1...Kxc5
        • 2.Qd5#
      • 1...Kxe5
        • 2.Qg7#
      • 1...Kc3!
    • 1.Qg3?
      • 1...Kxc5
        • 2.Qc3#
      • 1...hxg3!
    • 1.Qg4+?
      • 1...Kc3
        • 2.Qb4#
      • 1...Ke3
        • 2.Sc4#
        • 2.Sf5#
        • 2.Qe4#
        • 2.Qf4#
      • 1...Kxc5
        • 2.Qc4#
      • 1...Kxe5
        • 2.Qf4#
        • 2.Qg7#
      • 1...hxg4!
    • 1.Qf7?
      • 1...Ke3
        • 2.Qf2#
        • 2.Qf4#
      • 1...Kxc5
        • 2.Qc4#
        • 2.Qd5#
      • 1...Kxe5
        • 2.Qf4#
        • 2.Qg7#
      • 1...Kc3!
    • 1.e6+?
      • 1...Ke3
        • 2.Qc3#
      • 1...Kxc5!
  • Keys
    • 1.Qb7!
      • 1...Kc3
        • 2.Qb4#
      • 1...Ke3
        • 2.Sf5#
        • 2.Qe4#
      • 1...Kxc5
        • 2.Qd5#
      • 1...Kxe5
        • 2.Qb2#
        • 2.Qg7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAB(J)+P(H)
  • Tries
    • Try
      • Q(J);
      • Vars
        • K(a);S_FLIGHT::QAB(J)+P(H)
      • Refutation
        • K(a);S_FLIGHT,XP(G)
    • Try
      • Q(J);CHECK
      • Vars
        • K(a);OGATEB,S_FLIGHT,XP(H)::QAB(J)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(J);
      • Vars
        • K(a);S_FLIGHT,XP(G)::QAR1(J)
        • K(a);OGATEB,S_FLIGHT,XP(H)::QAB(J)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(J);
      • Vars
        • K(a);S_FLIGHT,XP(G)::QAR2(J)
      • Refutation
        • P(b);XQ(J)
    • Try
      • Q(J);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(J)
        • K(a);OGATE,S_FLIGHT,XP(G)::QAR1(J)
      • Refutation
        • P(c);XQ(J)
    • Try
      • Q(J);
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • P(H);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR2(J)
      • Refutation
        • K(a);S_FLIGHT,XP(G)
  • Actual
    • Q(J);
    • Vars
      • K(a);S_FLIGHT::QAB1(J)
      • K(a);S_FLIGHT,XP(G)::QAR1(J)
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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).