MESON Chess Problem Database

Problem Display
PID: 11818 (3R4/B1p1p1K1/3q1Nn1/p7/B1P1Rp2/n1Pk1P2/3p3p/3N4 w - - 0 1)

Knuppert, Hugo

2nd Place, KeyStip 06. Ty., 1972

3R4/B1p1p1K1/3q1Nn1/p7/B1P1Rp2/n1Pk1P2/3p3p/3N4

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Rdxd4#
    • 1...Qd5
      • 2.Rxd5#
    • 1...Qd7
      • 2.Rxd7#
  • Tries
    • 1.Sg4?
      • threat
        • 2.Sgf2#
      • 1...Qd4+
        • 2.Rdxd4#
      • 1...h1S!
    • 1.Sd5?
      • threat
        • 2.Sb2#
        • 2.Sf2#
      • 1...Qf6+
        • 2.Sxf6#
      • 1...Qxd5
        • 2.Rxd5#
      • 1...Sxc4
        • 2.Sf2#
      • 1...h1S
        • 2.Sb2#
      • 1...Qb4
        • 2.Sf2#
        • 2.Sxb4#
        • 2.Sxf4#
      • 1...Qc5
        • 2.Sb2#
        • 2.Sb4#
        • 2.Sxf4#
      • 1...Qb6
        • 2.Sb4#
        • 2.Sxf4#
        • 2.Sxb6#
      • 1...Qe5+!
    • 1.Sd7?
      • threat
        • 2.Sc5#
      • 1...Qe5+
        • 2.Sxe5#
      • 1...Qf6+
        • 2.Sxf6#
      • 1...Qxd7
        • 2.Rxd7#
      • 1...Qc5
        • 2.Sxc5#
        • 2.Se5#
      • 1...c5
        • 2.Sxc5#
      • 1...Qd4+!
    • 1.Re3+?
      • 1...Kxc4
        • 2.Sb2#
      • 1...fxe3!
  • Keys
    • 1.Bd4!
      • threat
        • 2.Sb2#
      • 1...Qxf6+
        • 2.Bxf6#
      • 1...Kxc4
        • 2.Sb2#
      • 1...Qxd4
        • 2.Rdxd4#
      • 1...Sxc4
        • 2.Sf2#
      • 1...Qb4
        • 2.Bc5#
      • 1...Qb6
        • 2.Bxb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • Q(g);OGATE,P_PINS(G)::R1(J),XQ(g)
    • Q(g);OGATE::R(J),XQ(g)
    • Q(g);OGATEB::R(J),XQ(g)
  • Tries
    • Try
      • S(G);
      • Threat
        • S(G)
      • Vars
        • Q(g);CHECK,OGATE::R1(J),XQ(g)
      • Refutation
        • P(b);
    • Try
      • S(G);N_PINQ(g)
      • Threat
        • DUALS(2)
      • Vars
        • Q(g);CHECK::R(J)+S(G),XQ(g)
        • Q(g);OGATE,P_SPINQ(g),XS(G)::R(J),XQ(g)
        • S(c);XP(E)::S(A)
        • P(b);::S(A)
      • Refutation
        • Q(g);CHECK
    • Try
      • S(G);N_PINQ(g)
      • Threat
        • S(G)
      • Vars
        • Q(g);CHECK::R(J)+S(G),DCHECK,XQ(g)
        • Q(g);CHECK::R(J)+S(G),XQ(g)
        • Q(g);OGATE,P_SPINQ(g),XS(G)::R(J),XQ(g)
        • P(i);::S(G),XP(i)
      • Refutation
        • Q(g);CHECK
    • Try
      • R(F);CHECK
      • Vars
        • K(d);N_SPINQ(g),S_FLIGHT,XP(E)::S(A)
      • Refutation
        • P(e);XR(F)
  • Actual
    • B(H);N_PINQ(g)
    • Threat
      • S(A)
    • Vars
      • Q(g);CHECK,OGATE,XS(G)::R(J)+B(H),XQ(g)
      • K(d);S_FLIGHT,XP(E)::S(A)
      • Q(g);OGATE,P_PINS(G),P_SPINQ(g),XB(H)::R1(J),XQ(g)
      • S(c);SBLOCK,XP(E)::S(A)
      • Q(g);OGATEB::R(J)+B(H)
      • Q(g);OGATEB::R(J)+B(H),XQ(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).