MESON Chess Problem Database

Problem Display
PID: 182468 (3Q2b1/6PN/3PpK1R/p2pP2P/qbR2npk/pp2p2B/5r1P/4B1N1 w - - 0 1)

Millins, James Lever

The Problemist, 1980

3Q2b1/6PN/3PpK1R/p2pP2P/qbR2npk/pp2p2B/5r1P/4B1N1

#2

13 + 13

SOLUTION

  • SOUND
  • Sets
    • 1...Bf7
      • 2.Kxf7#
    • 1...Bxh7
      • 2.Kf7#
    • 1...Se2+
      • 2.Kg6#
    • 1...Sg2+
      • 2.Kg6#
    • 1...Sd3+
      • 2.Kg6#
    • 1...Sxh3+
      • 2.Sf3#
    • 1...Sxh5+
      • 2.Kg6#
    • 1...Sg6+
      • 2.Kxg6#
    • 1...gxh3
      • 2.Rxf4#
  • Tries
    • 1.Bxf2+?
      • 1...g3
        • 2.Bxg3#
        • 2.Rxf4#
        • 2.hxg3#
      • 1...exf2!
  • Keys
    • 1.Ke7!
      • threat
        • 2.Kf8#
      • 1...Qd7+
        • 2.Kxd7#
      • 1...Qe8+
        • 2.Kxe8#
      • 1...Bxd6+
        • 2.Kxd6#
      • 1...Sg6+
        • 2.hxg6#
      • 1...Sxh3
        • 2.Sf3#
      • 1...Sxh5
        • 2.Rxg4#
      • 1...gxh3
        • 2.Rxf4#
      • 1...Se2
        • 2.Rxg4#
      • 1...Sg2
        • 2.Rxg4#
      • 1...Sd3
        • 2.Rxg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 5
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(m);::QAB(M)+K(I),XB(m)
    • B(m);XS(L)::QAB(M)+K(I)
    • S(g);CHECK,P_SPINP(h)::QAB(M)+K(I)
    • S(g);CHECK,P_SPINP(h),SBLOCK,XB(D)::S(B)
    • S(g);CHECK,P_SPINP(h),P_SPINS(g),XP(G)::QAB(M)+K(I)
    • S(g);CHECK,P_SPINP(h)::QAB(M)+K(I),XS(g)
    • P(h);OGATEB,P_SPINS(g),XB(D)::R(E),XS(g)
  • Tries
    • Try
      • B(A);CHECK,XR(a)
      • Refutation
        • P(d);XB(A)
  • Actual
    • K(I);P_SPINP(H),S_FLIGHT
    • Threat
      • QAB(M)+K(I)
    • Vars
      • Q(e);CHECK::QAB(M)+K(I),XQ(e)
      • B(f);CHECK,XP(H)::QAB(M)+K(I),XB(f)
      • S(g);CHECK,OGATE,P_SPINP(h)::R(J)+P(G),XS(g)
      • S(g);P_SPINP(h),SBLOCK,XB(D)::S(B)
      • S(g);OGATE,P_SPINP(h),P_SPINS(g),XP(G)::R1(E),XP(h)
      • P(h);OGATEB,P_SPINS(g),XB(D)::R(E),XS(g)
      • S(g);OGATE,P_SPINP(h)::R1(E),XP(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).