MESON Chess Problem Database

Problem Display
PID: 218553 (8/4q3/1B2P3/4k3/4N2p/7B/3N4/4K1Q1 w - - 0 1)

Bettmann, Edgar

Bettmann, Henry Wald

Bettmann, Jacob

St. Louis Globe Democrat, 1881

8/4q3/1B2P3/4k3/4N2p/7B/3N4/4K1Q1

#2

7 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Qh2#
    • 1...Qa3
      • 2.Qg5#
    • 1...Qb4
      • 2.Qg5#
    • 1...Qg5
      • 2.Qxg5#
    • 1...Qd6
      • 2.Qg5#
    • 1...Qa7
      • 2.Qg5#
    • 1...Qb7
      • 2.Qg5#
    • 1...Qc7
      • 2.Qg5#
    • 1...Qd7
      • 2.Qg5#
    • 1...Qe8
      • 2.Qg5#
  • Tries
    • 1.Bd4+?
      • 1...Kf4
        • 2.Qf2#
        • 2.Qh2#
        • 2.Qe3#
        • 2.Qf1#
        • 2.Qg4#
      • 1...Kd5!
    • 1.Qc5+?
      • 1...Kf4
        • 2.Qf5#
      • 1...Qxc5!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Qd4#
      • 1...Kf4
        • 2.Qe3#
      • 1...Kd5
        • 2.Qc5#
      • 1...Kxd6
        • 2.Qc5#
      • 1...Kf6
        • 2.Bd4#
      • 1...Qxd6
        • 2.Qg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • K(b);S_FLIGHT::QAB(B)
    • Q(c);N_GUARD::QAR2(B)
    • Q(c);N_GUARD,P_PINS(C)::QAR2(B)
    • Q(c);N_GUARD::QAR2(B),XQ(c)
  • Tries
    • Try
      • B(F);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR1(B)
      • Refutation
        • Q(c);XQ(B)
  • Actual
    • S(E);
    • Threat
      • QAB1(B)
    • Vars
      • K(b);P_PINP(G),S_FLIGHT::QAB1(B)
      • K(b);P-FLIGHT,P_PINP(G)::QAR1(B)
      • K(b);P_PINP(G),S_FLIGHT,XS(E)::QAB1(B)
      • K(b);P_PINP(G),S_FLIGHT::B(F)
      • Q(c);N_GUARD,SBLOCK,XS(E)::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).