MESON Chess Problem Database

Problem Display
PID: 101183 (2Q1Kn2/1p1r1N1p/1p2k1nR/1P1pppP1/8/1N6/5p2/5B2 w - - 0 1)

Papp, Jeno

Good Companions (April), 1924

2Q1Kn2/1p1r1N1p/1p2k1nR/1P1pppP1/8/1N6/5p2/5B2

#2

8 + 11

38 Magyar Sakkvilag 1930
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...d4
      • 2.Bc4#
    • 1...e4
      • 2.Sd4#
    • 1...f4
      • 2.Bh3#
  • Tries
    • 1.Sa1?
      • 1...d4
        • 2.Bc4#
      • 1...f4
        • 2.Bh3#
      • 1...e4!
    • 1.Sc1?
      • 1...d4
        • 2.Bc4#
      • 1...f4
        • 2.Bh3#
      • 1...e4!
    • 1.Sd2?
      • 1...d4
        • 2.Bc4#
      • 1...f4
        • 2.Bh3#
      • 1...e4!
    • 1.Rxg6+?
      • 1...Sxg6
        • 2.Qxd7#
      • 1...hxg6!
    • 1.Qc6+?
      • 1...Rd6
        • 2.Sd8#
        • 2.Qxd6#
      • 1...bxc6!
    • 1.Qc7?
      • threat
        • 2.Qxe5#
      • 1...Re7+
        • 2.Qxe7#
      • 1...Rd8+
        • 2.Sxd8#
      • 1...Rxf7
        • 2.Qxb6#
      • 1...Rd6
        • 2.Qxd6#
        • 2.Qe7#
      • 1...e4
        • 2.Sd4#
        • 2.Qe5#
      • 1...Rxc7!
  • Keys
    • 1.Qc5!
      • 1...Re7+
        • 2.Qxe7#
      • 1...Rd8+
        • 2.Sxd8#
      • 1...Rxf7
        • 2.Qxb6#
      • 1...bxc5
        • 2.Sxc5#
      • 1...f4
        • 2.Bh3#
      • 1...Rd6
        • 2.Qxd6#
      • 1...Rc7
        • 2.Sd8#
        • 2.Qd6#
      • 1...d4
        • 2.Qxe5#
      • 1...e4
        • 2.Sd4#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATEB::B(A)
    • P(c);N_GUARD::S(B)
    • P(d);OGATEB::B(A)
  • Tries
    • Try
      • S(B);
      • Vars
        • P(b);OGATEB::B(A)
        • P(d);OGATEB::B(A)
      • Refutation
        • P(c);
    • Try
      • S(B);
      • Vars
        • P(b);OGATEB::B(A)
        • P(d);OGATEB::B(A)
      • Refutation
        • P(c);
    • Try
      • S(B);
      • Vars
        • P(b);OGATEB::B(A)
        • P(d);OGATEB::B(A)
      • Refutation
        • P(c);
    • Try
      • R(E);CHECK,XS(g)
      • Vars
        • S(k);XR(E)::QAB1(G),XR(i)
      • Refutation
        • P(j);XR(E)
    • Try
      • Q(G);CHECK,N_PINR(i)
      • Refutation
        • P(h);XQ(G)
    • Try
      • Q(G);N_PINR(i)
      • Threat
        • QAR1(G),XP(c)
      • Vars
        • R(i);CHECK,OGATE::QAR1(G),XR(i)
        • R(i);CHECK,N_GUARD::S(F),XR(i)
        • R(i);N_GUARD,XS(F)::QAR(G),XP(e)
      • Refutation
        • R(i);XQ(G)
  • Actual
    • Q(G);N_PINR(i)
    • Vars
      • R(i);CHECK,N_GUARD::QAR1(G),XR(i)
      • R(i);CHECK,N_GUARD::S(F),XR(i)
      • R(i);N_GUARD,XS(F)::QAR(G),XP(e)
      • P(e);XQ(G)::S(B),XP(e)
      • P(d);OGATEB::B(A)
      • R(i);N_GUARD::QAR1(G),XR(i)
      • P(b);OGATE::QAR1(G),XP(c)
      • P(c);N_GUARD::S(B)
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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).