MESON Chess Problem Database

Problem Display
PID: 18850 (7K/8/3pp3/Np1k1P1R/1P1Pq1Qp/3R1n1r/3n1N2/B2b3B w - - 0 1)

Whyatt, William Albert

The Problemist, 1958

7K/8/3pp3/Np1k1P1R/1P1Pq1Qp/3R1n1r/3n1N2/B2b3B

#2

11 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4+
      • 2.Qxd4#
    • 1...Qe5+
      • 2.dxe5#
    • 1...Sb1
      • 2.Qxe4#
    • 1...Sf1
      • 2.Qxe4#
    • 1...Sb3
      • 2.Qxe4#
    • 1...Sc4
      • 2.Qxe4#
    • 1...Se1
      • 2.fxe6#
    • 1...Sg1
      • 2.fxe6#
    • 1...Sh2
      • 2.fxe6#
    • 1...Sxd4
      • 2.fxe6#
    • 1...e5
      • 2.Qg8#
  • Tries
    • 1.fxe6+?
      • 1...Qf5
        • 2.Qxf5#
      • 1...Qe5+
        • 2.dxe5#
      • 1...Sg5
        • 2.Rxg5#
        • 2.Qf5#
      • 1...Se5!
  • Keys
    • 1.Qg8!
      • threat
        • 2.Qa8#
      • 1...Qxd4+
        • 2.f6#
      • 1...Qe5+
        • 2.dxe5#
      • 1...Sxd4
        • 2.Qxe6#
      • 1...Se5
        • 2.Qxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • Q(e);CHECK,OGATE,P_SPINQ(e),P_SPINS(c),XP(F)::QAR1(G),XQ(e)
    • Q(e);CHECK,OGATE,P_SPINS(c)::R(D)+P(F),XQ(e)
    • S(b);N_GUARD::QAB1(G),XQ(e)
    • S(c);N_GUARD,P_SPINQ(e)::R(J)+P(I),XP(j)
    • S(c);N_GUARD,P_SPINQ(e),P_SPINS(c),XP(F)::R(J)+P(I),XP(j)
    • P(j);OGATEB::QAB(G)
  • Tries
    • Try
      • P(I);CHECK,XP(j)
      • Vars
        • Q(e);N_GUARD,P_SPINQ(e),P_SPINS(c)::QAR2(G),XQ(e)
        • Q(e);CHECK,OGATE,P_SPINQ(e),P_SPINS(c)::R(D)+P(F),XQ(e)
      • Refutation
        • S(c);P_SPINQ(e),P_SPINS(c)
  • Actual
    • Q(G);P_PINP(j)
    • Threat
      • QAB(G)
    • Vars
      • Q(e);CHECK,N_GUARD,P_SPINQ(e),P_SPINS(c),XP(F)::R(J)+P(I)
      • Q(e);CHECK,OGATE,P_SPINS(c)::R(D)+P(F),XQ(e)
      • S(c);P_SPINQ(e),P_SPINS(c),XP(F)::QAB1(G),XP(j)
      • S(c);P_SPINQ(e)::QAB1(G),XP(j)
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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).