MESON Chess Problem Database

Problem Display
PID: 185977 (8/2K5/3B4/2PkP3/3p4/1P1n1P1B/2PQP3/2n5 w - - 0 1)

Faria, Oswaldo

Chess, 1958

8/2K5/3B4/2PkP3/3p4/1P1n1P1B/2PQP3/2n5

#2

10 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Se1
      • 2.c4#
      • 2.e4#
    • 1...Sb2
      • 2.e4#
    • 1...Sf2
      • 2.c4#
    • 1...Sb4
      • 2.c4#
      • 2.e4#
    • 1...Sf4
      • 2.c4#
      • 2.e4#
    • 1...Sxc5
      • 2.c4#
    • 1...Sxe5
      • 2.e4#
  • Tries
    • 1.Qa5?
      • threat
        • 2.Qa8#
      • 1...Sxc5
        • 2.Qxc5#
      • 1...Sxe5
        • 2.c6#
      • 1...Sb4
        • 2.c6#
      • 1...Sxb3!
    • 1.Qxd3?
      • threat
        • 2.Qc4#
        • 2.Qe4#
        • 2.c4#
        • 2.e4#
      • 1...Sxe2
        • 2.Qc4#
        • 2.Qe4#
        • 2.c4#
      • 1...Sxb3
        • 2.Qxb3#
        • 2.c4#
        • 2.e4#
      • 1...Sxd3!
  • Keys
    • 1.Qg5!
      • threat
        • 2.Qg8#
      • 1...Sxc5
        • 2.e6#
      • 1...Sxe5
        • 2.Qxe5#
      • 1...Sf4
        • 2.e6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • S(b);P_SPINP(c)::P(C)
    • S(b);P_SPINP(c)::P(A)
    • S(b);P_SPINP(c),XP(G)::P(A)
    • S(b);P_SPINP(c),XP(H)::P(C)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB(B)
      • Vars
        • S(b);OGATE,P_SPINS(b),XP(G)::QAR1(B),XS(b)
        • S(b);N_GUARD,XP(H)::QAR(B)+P(G)
        • S(b);N_GUARD::QAR(B)+P(G)
      • Refutation
        • S(a);XP(D)
    • Try
      • Q(B);P_PINP(c),XS(b)
      • Threat
        • DUALS(4)
      • Refutation
        • S(a);N_SPINP(c),XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB(B)
    • Vars
      • S(b);N_GUARD,XP(G)::QAR(B)+P(H)
      • S(b);OGATE,P_SPINS(b),XP(H)::QAR1(B),XS(b)
      • S(b);N_GUARD::QAR(B)+P(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).