MESON Chess Problem Database

Problem Display
PID: 172086 (Q4R2/8/2N3K1/nk3B2/Nn4RP/1p6/p1p2p2/4b3 w - - 0 1)

Apro, Laszlo

Australian Chess, 1933

Q4R2/8/2N3K1/nk3B2/Nn4RP/1p6/p1p2p2/4b3

#2

8 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kxa4
      • 2.Qxa5#
    • 1...Sa6
      • 2.Sa7#
    • 1...Sc4
      • 2.Sd4#
  • Tries
    • 1.Bd3+?
      • 1...Kxa4
        • 2.Qxa5#
      • 1...Sc4
        • 2.Sd4#
        • 2.Bxc4#
        • 2.Rb8#
      • 1...Sxd3!
    • 1.Rb8+?
      • 1...Kxa4
        • 2.Qxa5#
      • 1...Sb7!
    • 1.Qa6+?
      • 1...Kxa4
        • 2.Qxa5#
      • 1...Sxa6
        • 2.Sa7#
      • 1...Kxa6!
  • Keys
    • 1.Bd7!
      • threat
        • 2.Qxa5#
      • 1...Kxa4
        • 2.Qxa5#
      • 1...Sbxc6
        • 2.Rf5#
      • 1...Saxc6
        • 2.Rb8#
      • 1...Sd3
        • 2.Sxa5#
      • 1...Sd5
        • 2.Sxa5#
      • 1...Sa6
        • 2.Sa7#
      • 1...Sc4
        • 2.Sd4#
      • 1...Sb7
        • 2.Sxb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(h);P_SPINS(f),S_FLIGHT,XS(A)::QAR1(G),XS(g)
    • S(f);SBLOCK::S(E)
    • S(g);SBLOCK::S(E)
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • K(h);P_SPINS(f),S_FLIGHT,XS(A)::QAR1(G),XS(g)
      • Refutation
        • S(f);XB(D)
    • Try
      • R(H);CHECK
      • Vars
        • K(h);P_SPINS(f),S_FLIGHT,XS(A)::QAR1(G),XS(g)
      • Refutation
        • S(g);P_SPINS(g)
    • Try
      • Q(G);CHECK
      • Vars
        • K(h);P_SPINS(f),S_FLIGHT,XS(A)::QAR1(G),XS(g)
        • S(f);SBLOCK,XQ(G)::S(E)
      • Refutation
        • K(h);S_FLIGHT,XQ(G)
  • Actual
    • B(D);
    • Threat
      • QAR1(G),XS(g)
    • Vars
      • K(h);P_SPINS(f),S_FLIGHT,XS(A)::QAR1(G),XS(g)
      • S(f);N_GUARD,P_SPINS(f),XS(E)::R(H)
      • S(g);N_GUARD,P_SPINS(g),XS(E)::R(H)
      • S(f);N_GUARD::B(D)+S(E),XS(g)
      • S(f);SBLOCK::B(D)+S(E),DCHECK
      • S(g);SBLOCK::B(D)+S(E),DCHECK
      • S(g);N_GUARD::B(D)+S(E),XS(f)
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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).