MESON Chess Problem Database

Problem Display
PID: 63184 (5q2/b1P5/r1B2Pnn/3N3R/1RPrk3/2BpN2p/7P/5QK1 w - - 0 1)

Driver, John Edward

1st Prize, Problem Observer, 1973

5q2/b1P5/r1B2Pnn/3N3R/1RPrk3/2BpN2p/7P/5QK1

#2

12 + 9

3753 FIDE Album (1971-1973) 1978

SOLUTION

  • SOUND
  • Sets
    • 1...Sf4
      • 2.Qxf4#
    • 1...Sh4
      • 2.Qf4#
    • 1...Se5
      • 2.Qf4#
    • 1...Se7
      • 2.Qf4#
    • 1...Sh8
      • 2.Qf4#
    • 1...Sg4
      • 2.Qf5#
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sf7
      • 2.Qf5#
    • 1...Sg8
      • 2.Qf5#
  • Tries
    • 1.Sb6+?
      • 1...Kxe3
        • 2.Rxh3#
        • 2.Qf2#
        • 2.Qf3#
      • 1...Rd5!
    • 1.Bd2?
      • threat
        • 2.Sc3#
      • 1...Rxd5
        • 2.c5#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Rxc4!
    • 1.Rh4+?
      • 1...Sf4
        • 2.Qxf4#
      • 1...Sxh4
        • 2.Qf4#
      • 1...Sg4
        • 2.Qf5#
      • 1...Ke5!
    • 1.Re5+?
      • 1...Sxe5
        • 2.Qf4#
      • 1...Kxe5!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Sg3#
      • 1...Rxc4+
        • 2.Sb6#
      • 1...Rxd5+
        • 2.c5#
      • 1...Ke5
        • 2.Qe1#
      • 1...Sxf5
        • 2.Qxf5#
      • 1...Qd6
        • 2.Sxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 8
  • Sets
    • S(f);N_GUARD::QAR1(A),XS(f)
    • S(f);N_GUARD::QAR1(A)
    • S(g);N_GUARD::QAB1(A)
    • S(g);N_GUARD::QAB1(A),XS(g)
  • Tries
    • Try
      • S(H);CHECK
      • Refutation
        • R(c);P_SPINR(c)
    • Try
      • B(D);
      • Threat
        • B(J)+S(H),DCHECK
      • Vars
        • R(c);P_PINS(E),P_SPINR(c),XS(H)::R(F)+P(G)
        • S(g);N_GUARD::QAB1(A),XS(g)
      • Refutation
        • R(c);P_PINS(E),P_SPINR(c),XP(G)
    • Try
      • R(I);CHECK
      • Vars
        • S(f);N_GUARD,P_SPINS(f)::QAR1(A),XS(f)
        • S(f);N_GUARD,XR(I)::QAR1(A)
        • S(g);P_SPINS(g)::QAB1(A)
      • Refutation
        • K(d);P-FLIGHT,P_SPINR(c)
    • Try
      • R(I);CHECK
      • Vars
        • S(f);XR(I)::QAR1(A)
      • Refutation
        • K(d);P-FLIGHT,P_SPINR(c),XR(I)
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • R(c);CHECK,N_GUARD,P_SPINR(c),XP(G)::B(J)+S(H)
      • R(c);CHECK,P_SPINR(c),XS(H)::R(F)+P(G)
      • K(d);P-FLIGHT,P_SPINR(c)::QAR(A)
      • S(g);OGATE,XS(E)::QAB1(A),XS(g)
      • Q(i);N_GUARD::S(E),XQ(i)
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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).