MESON Chess Problem Database

Problem Display
PID: 267153 (QBB5/8/3pp3/1p2k1PK/1P2p2R/4p3/4P3/1b4N1 w - - 0 1)

Driver, John Edward

The Problemist, 1955

QBB5/8/3pp3/1p2k1PK/1P2p2R/4p3/4P3/1b4N1

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Qd5#
    • 1...Ba2
      • 2.Qxe4#
  • Tries
    • 1.Sf3+?
      • 1...Kf5
        • 2.Qd5#
      • 1...exf3!
    • 1.Bxe6?
      • threat
        • 2.Qd5#
      • 1...Kd4
        • 2.Qa1#
      • 1...Ba2
        • 2.Rxe4#
        • 2.Qxe4#
      • 1...Kxe6!
    • 1.Rxe4+?
      • 1...Kf5
        • 2.Bxe6#
        • 2.Qd5#
      • 1...Bxe4!
    • 1.Qa1+?
      • 1...Kf5
        • 2.Qf6#
      • 1...Kd5!
  • Keys
    • 1.Qc6!
      • threat
        • 2.Qc5#
      • 1...Kd4
        • 2.Sf3#
      • 1...Kf5
        • 2.Qd5#
      • 1...Ba2
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(e);N_GUARD,N_SPINP(f),P-FLIGHT,P_SPINP(g)::QAR2(G)
    • B(a);N_GUARD::QAR1(G),XP(c)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • K(e);N_GUARD,N_SPINP(f),P-FLIGHT,P_SPINP(g)::QAR2(G)
      • Refutation
        • P(c);XS(A)
    • Try
      • B(I);XP(g)
      • Threat
        • QAR1(G)
      • Vars
        • K(e);N_GUARD,N_SPINP(f),P_SPINP(c),S_FLIGHT::QAB(G)
      • Refutation
        • K(e);N_SPINP(f),P-FLIGHT,XB(I)
    • Try
      • R(D);CHECK,XP(c)
      • Refutation
        • B(a);XR(D)
    • Try
      • Q(G);CHECK
      • Vars
        • K(e);N_SPINP(f),OGATE,P-FLIGHT,P_SPINP(g)::QAR1(G)
      • Refutation
        • K(e);N_SPINP(f),P-FLIGHT
  • Actual
    • Q(G);
    • Threat
      • QAR2(G)
    • Vars
      • K(e);N_GUARD,N_SPINP(f),P_SPINP(c),S_FLIGHT::S(A)
      • K(e);N_GUARD,N_SPINP(f),P-FLIGHT,P_SPINP(g)::QAR2(G)
      • B(a);N_GUARD::QAR1(G),XP(c)
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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).