MESON Chess Problem Database

Problem Display
PID: 60171 (6K1/4b2p/1Pp4N/1nN1k3/2P2p2/8/2b5/3R2Q1 w - - 0 1)

Berd, Benjamin M

Comm., Brisbane Courier, 1930

6K1/4b2p/1Pp4N/1nN1k3/2P2p2/8/2b5/3R2Q1

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6
      • 2.Qg7#
    • 1...Bd6
      • 2.Qg7#
    • 1...Sa3
      • 2.Qd4#
    • 1...Sc3
      • 2.Qd4#
    • 1...Sd4
      • 2.Qxd4#
    • 1...Sd6
      • 2.Qd4#
    • 1...Sa7
      • 2.Qd4#
    • 1...Sc7
      • 2.Qd4#
  • Tries
    • 1.Sf7+?
      • 1...Kf6
        • 2.Qg5#
      • 1...Kf5!
    • 1.Re1+?
      • 1...Kd6
        • 2.Sf7#
        • 2.Re6#
      • 1...Kf6
        • 2.Sd7#
        • 2.Re6#
        • 2.Qg7#
      • 1...Be4!
    • 1.Rd5+?
      • 1...Kf6
        • 2.Qg5#
        • 2.Qg7#
      • 1...cxd5!
    • 1.Qg5+?
      • 1...Bf5
        • 2.Sg4#
        • 2.Sf7#
        • 2.Qxf5#
      • 1...Bxg5!
  • Keys
    • 1.Rd6!
      • threat
        • 2.Re6#
      • 1...Kxd6
        • 2.Sf7#
      • 1...Bxd6
        • 2.Qg7#
      • 1...Sxd6
        • 2.Qa1#
      • 1...f3
        • 2.Qh2#
        • 2.Qg3#
      • 1...Bf5
        • 2.Sf7#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sc7
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • K(d);S_FLIGHT::QAB1(B)
    • B(f);N_GUARD::QAB(B)
    • S(c);N_GUARD::QAB1(B)
    • S(c);N_GUARD::QAB1(B),XS(c)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(d);S_FLIGHT::QAB1(B)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • R(A);CHECK
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • R(A);CHECK
      • Refutation
        • P(e);XR(A)
    • Try
      • Q(B);CHECK
      • Refutation
        • B(f);XQ(B)
  • Actual
    • R(A);
    • Threat
      • R1(A)
    • Vars
      • K(d);S_FLIGHT,XR(A)::S(F)
      • B(f);N_GUARD,SBLOCK,XR(A)::QAB(B)
      • S(c);N_GUARD,SBLOCK,XR(A)::QAB(B)
      • B(a);SBLOCK::S(F)
      • S(c);N_GUARD::QAB1(B),XS(c)
      • S(c);N_GUARD::QAB1(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).