MESON Chess Problem Database

Problem Display
PID: 271501 (4r3/1pN5/1Bk1P2b/Pp2pN2/1pb5/3Rp3/2P1K3/2R3Q1 w - - 0 1)

Driver, John Edward

The Problemist, 1956

4r3/1pN5/1Bk1P2b/Pp2pN2/1pb5/3Rp3/2P1K3/2R3Q1

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Re7
      • 2.Sxe7#
    • 1...Ra8
      • 2.Se7#
    • 1...Rb8
      • 2.Se7#
    • 1...Rc8
      • 2.Se7#
    • 1...Rd8
      • 2.Se7#
    • 1...Rf8
      • 2.Se7#
    • 1...Rg8
      • 2.Se7#
    • 1...Rh8
      • 2.Se7#
    • 1...Ba2
      • 2.Rd6#
    • 1...Bb3
      • 2.Rd6#
      • 2.cxb3#
    • 1...Bxd3+
      • 2.cxd3#
    • 1...Bxe6
      • 2.Rd6#
  • Tries
    • 1.Qh1+?
      • 1...Bd5
        • 2.Qxd5#
      • 1...e4!
    • 1.Qg2+?
      • 1...Bd5
        • 2.Qxd5#
      • 1...e4!
    • 1.Qg7?
      • threat
        • 2.Qd7#
      • 1...Bxd3+
        • 2.cxd3#
      • 1...Bxe6
        • 2.Rd6#
      • 1...Re7
        • 2.Sxe7#
      • 1...Rd8
        • 2.Se7#
      • 1...Bxg7!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Qxe8#
      • 1...Bxd3+
        • 2.cxd3#
      • 1...Rxe6
        • 2.Se7#
      • 1...Bxe6
        • 2.Rd6#
      • 1...Re7
        • 2.Sxe7#
      • 1...Ra8
        • 2.Se7#
      • 1...Rb8
        • 2.Se7#
      • 1...Rc8
        • 2.Se7#
      • 1...Rd8
        • 2.Se7#
      • 1...Rf8
        • 2.Se7#
      • 1...Rg8
        • 2.Se7#
      • 1...Rh8
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(i);N_GUARD::S(G),XR(i)
    • R(i);N_GUARD::S(G)
    • B(c);N_PINR(E)::R1(E)
    • B(c);CHECK,OGATE,XR(E)::R(A)+P(C),XB(c)
    • B(c);N_PINR(E),XP(I)::R1(E)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • B(c);N_GUARD,N_PINR(E),P_SPINB(c)::QAB1(B),XB(c)
      • Refutation
        • P(e);P_SPINP(e)
    • Try
      • Q(B);CHECK
      • Vars
        • B(c);N_GUARD,N_PINR(E),P_SPINB(c)::QAB1(B),XB(c)
      • Refutation
        • P(e);P_SPINP(e)
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • B(c);CHECK,OGATE,XR(E)::R(A)+P(C),XB(c)
        • B(c);N_PINR(E),XP(I)::R1(E)
        • R(i);N_GUARD::S(G),XR(i)
        • R(i);N_GUARD::S(G)
      • Refutation
        • B(g);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB(B),XR(i)
    • Vars
      • B(c);CHECK,OGATE,XR(E)::R(A)+P(C),XB(c)
      • R(i);N_GUARD,P_SPINR(i),XP(I)::S(G)
      • B(c);N_PINR(E),P_SPINB(c),XP(I)::R1(E)
      • R(i);N_GUARD::S(G),XR(i)
      • R(i);N_GUARD::S(G)
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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).