MESON Chess Problem Database

Problem Display
PID: 222787 (bb4Bq/2P5/3R2Qp/4pp2/r1p1k3/6PN/4P1n1/6BK w - - 0 1)

Bettmann, Edgar

Bettmann, Henry Wald

Bettmann, Jacob

St. Louis Globe Democrat, 1883

bb4Bq/2P5/3R2Qp/4pp2/r1p1k3/6PN/4P1n1/6BK

#2

9 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bd5
      • 2.Bxd5#
    • 1...Se3
      • 2.Sf2#
    • 1...h5
      • 2.Sg5#
  • Tries
    • 1.Qg4+?
      • 1...Sf4
        • 2.Qf3#
      • 1...f4
        • 2.Qg6#
      • 1...fxg4!
    • 1.Qxh6?
      • threat
        • 2.Sf2#
        • 2.Sg5#
      • 1...Qxg8
        • 2.Sf2#
      • 1...f4
        • 2.Qg6#
      • 1...Qf6
        • 2.Sf2#
      • 1...Qg7
        • 2.Sf2#
      • 1...Bd5
        • 2.Sg5#
        • 2.Bxd5#
      • 1...Ba7
        • 2.Sg5#
      • 1...Sf4
        • 2.Sg5#
      • 1...Qxh6!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Rd4#
      • 1...f4
        • 2.Qg6#
      • 1...Bd5
        • 2.Bxd5#
      • 1...Ba7
        • 2.Qxa8#
      • 1...Se3
        • 2.Sf2#
      • 1...c3
        • 2.Qxa4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(h);N_GUARD::B(I),XB(h)
    • S(a);SBLOCK::S(E)
    • P(g);N_GUARD::S(E)
  • Tries
    • Try
      • Q(G);CHECK,N_PINP(f)
      • Vars
        • S(a);P_SPINS(a)::QAB1(G)
        • P(f);OGATEB,P_SPINP(f)::QAB(G)
      • Refutation
        • P(f);XQ(G)
    • Try
      • Q(G);N_PINP(f),XP(g)
      • Threat
        • DUALS(2)
      • Vars
        • Q(j);XB(I)::S(E)
        • P(f);OGATEB::QAB(G)
        • Q(j);::S(E)
        • B(i);::S(E)
        • S(a);::S(E)
      • Refutation
        • Q(j);P_PINS(E),XQ(G)
  • Actual
    • Q(G);N_PINP(f),P_PINP(e)
    • Threat
      • R1(F)
    • Vars
      • P(f);OGATEB::QAB(G)
      • B(h);N_GUARD::B(I),XB(h)
      • B(i);OGATE::QAB(G),XB(h)
      • S(a);SBLOCK::S(E)
      • P(c);OGATEB::QAR(G),XR(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).