MESON Chess Problem Database

Problem Display
PID: 139899 (5B2/3B4/8/np1k1K2/3P2p1/2r1p3/1NPnN3/Q7 w - - 0 1)

Perkins, Henry (Harry)

The Problemist, 1938

5B2/3B4/8/np1k1K2/3P2p1/2r1p3/1NPnN3/Q7

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sdb3
      • 2.Qh1#
    • 1...Sdc4
      • 2.Qh1#
    • 1...Sac4
      • 2.Qa8#
    • 1...Sc6
      • 2.Be6#
  • Tries
    • 1.Bc5?
      • threat
        • 2.Sxc3#
        • 2.Sf4#
      • 1...Rxc2
        • 2.Sf4#
      • 1...Ra3
        • 2.Sf4#
      • 1...Rb3
        • 2.Sf4#
      • 1...Rd3
        • 2.Sf4#
      • 1...Rc4
        • 2.Sf4#
      • 1...Sb1
        • 2.Sf4#
      • 1...Se4
        • 2.Sf4#
      • 1...b4
        • 2.Sf4#
      • 1...Rxc5!
    • 1.Qh1+?
      • 1...Se4
        • 2.Qxe4#
      • 1...Sf3!
  • Keys
    • 1.Sc4!
      • threat
        • 2.Sb6#
      • 1...Kxc4
        • 2.Be6#
      • 1...Rxc4
        • 2.Sf4#
      • 1...Sdxc4
        • 2.Qh1#
      • 1...Saxc4
        • 2.Qa8#
      • 1...bxc4
        • 2.Qxa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(a);N_GUARD::QAB(A)
    • S(e);OGATE::QAB(A)
    • S(e);SBLOCK::B(G)
  • Tries
    • Try
      • B(H);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);XP(C)::S(D)
        • R(b);::S(D)
        • S(a);::S(D)
        • P(f);::S(D)
      • Refutation
        • R(b);XB(H)
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • S(a);P_SPINS(a)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • K(g);S_FLIGHT,XS(B)::B(G)
      • R(b);SBLOCK,XS(B)::S(D)
      • S(a);N_GUARD,SBLOCK,XS(B)::QAB(A)
      • S(e);OGATE,SBLOCK,XS(B)::QAB(A)
      • P(f);OGATEB,SBLOCK,XS(B)::QAR(A),XS(e)
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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).