MESON Chess Problem Database

Problem Display
PID: 24920 (1b1nB3/p1P4p/q3k2r/pN3p1b/4p2Q/8/3R1P1K/B7 w - - 0 1)

Howard, Kenneth Samuel

Dagens Nyheder, 1935

1b1nB3/p1P4p/q3k2r/pN3p1b/4p2Q/8/3R1P1K/B7

#2

8 + 11

5088 How to Solve Chess Problems 1945

SOLUTION

  • SOUND
  • Sets
    • 1...Qb7
      • 2.Rd6#
    • 1...Qc8
      • 2.Rd6#
    • 1...Qd6+
      • 2.Rxd6#
    • 1...Rf6
      • 2.Qxf6#
    • 1...Bf7
      • 2.Bd7#
    • 1...Bxc7+
      • 2.Sxc7#
    • 1...Sc6
      • 2.Rd6#
    • 1...Sf7
      • 2.Bd7#
  • Tries
    • 1.cxb8Q?
      • threat
        • 2.Sc7#
        • 2.Qe5#
      • 1...Qd6+
        • 2.Rxd6#
        • 2.Qxd6#
      • 1...Qxb5
        • 2.Rd6#
        • 2.Qd6#
      • 1...Rf6
        • 2.Qxf6#
        • 2.Qe5#
      • 1...f4
        • 2.Qe5#
      • 1...Qb7
        • 2.Rd6#
        • 2.Qe5#
        • 2.Qd6#
      • 1...Qc8
        • 2.Rd6#
        • 2.Qe5#
        • 2.Qd6#
        • 2.Qxc8#
      • 1...Qb6
        • 2.Qe5#
        • 2.Qc8#
      • 1...Qc6
        • 2.Qe5#
      • 1...Sc6
        • 2.Sc7#
        • 2.Rd6#
        • 2.Qd6#
      • 1...Sf7
        • 2.Sc7#
        • 2.Bd7#
      • 1...Bxe8!
  • Keys
    • 1.f4!
      • threat
        • 2.cxd8S#
      • 1...Bxc7
        • 2.Sxc7#
      • 1...exf4 ep
        • 2.Qe1#
      • 1...Rf6
        • 2.Qxf6#
      • 1...Qc8
        • 2.Rd6#
      • 1...Qb6
        • 2.c8Q#
        • 2.c8B#
      • 1...Qd6
        • 2.Rxd6#
      • 1...Sc6
        • 2.Rd6#
      • 1...Sb7
        • 2.c8Q#
        • 2.c8B#
      • 1...Sf7
        • 2.Bd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • Q(e);N_GUARD::R1(B)
    • Q(e);CHECK,N_GUARD,N_PINP(G)::R1(B),XQ(e)
    • R(g);N_GUARD::QAR1(E),XR(g)
    • B(d);P_PINQ(E),SBLOCK::B(H)
    • B(j);CHECK,XP(G)::S(F),XB(j)
    • S(k);S_CUTQ(e)::R1(B)
    • S(k);SBLOCK::B(H)
  • Tries
    • Try
      • P(G);N_SPINP(G),XB(j)
      • Threat
        • DUALS(2)
      • Vars
        • P(c);::QAR1(G)
        • Q(e);::QAR1(G)
      • Refutation
        • B(d);P_PINQ(E),XB(H)
  • Actual
    • P(C);N_SPINP(G)
    • Threat
      • PXS(k)=S
    • Vars
      • B(j);P_PINP(C),XP(G)::S(F),XB(j)
      • P(a);EP,OGATEB,P_PINP(G),XP(C)::QAR(E)
      • R(g);N_GUARD::QAR1(E),XR(g)
      • Q(e);N_GUARD::R1(B)
      • Q(e);N_GUARD::P=Q
      • Q(e);N_GUARD,P_PINP(C)::R1(B),XQ(e)
      • S(k);S_CUTQ(e)::R1(B)
      • S(k);S_CUTQ(e)::P=Q
      • S(k);SBLOCK::B(H)
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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).