MESON Chess Problem Database

Problem Display
PID: 249578 (1NB1q3/2p1Rp2/Pn3n2/2Pkp3/P4P2/3b4/P2N2P1/3QK1B1 w - - 0 1)

Grzebeta, Jorg

Deutsche Schachzeitung, 1977

1NB1q3/2p1Rp2/Pn3n2/2Pkp3/P4P2/3b4/P2N2P1/3QK1B1

#2

13 + 8

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa4
      • 2.Rxe5#
    • 1...Qb5
      • 2.Rxe5#
    • 1...Qc6
      • 2.Rxe5#
    • 1...Qd7
      • 2.Rxe5#
    • 1...Qxc8
      • 2.Rxe5#
    • 1...Qd8
      • 2.Rxe5#
    • 1...Qf8
      • 2.Rxe5#
    • 1...Qg8
      • 2.Rxe5#
    • 1...Qh8
      • 2.Rxe5#
  • Tries
    • 1.Sc4?
      • threat
        • 2.Qxd3#
      • 1...Kxc4
        • 2.Qb3#
      • 1...Ke4
        • 2.Qf3#
      • 1...e4!
    • 1.Bb7+?
      • 1...Qc6
        • 2.Bxc6#
        • 2.Rxe5#
      • 1...c6!
    • 1.Qb3+?
      • 1...Sc4
        • 2.Qxd3#
      • 1...Bc4!
  • Keys
    • 1.Sc6!
      • threat
        • 2.Sb4#
      • 1...Kxc6
        • 2.Bb7#
      • 1...Qxc6
        • 2.Rxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • Q(h);N_GUARD,XP(G)::R1(K),XP(c)
    • Q(h);N_GUARD::R1(K),XP(c)
    • Q(h);N_GUARD,XB(M)::R1(K),XP(c)
  • Tries
    • Try
      • S(E);P_PINB(a)
      • Threat
        • QAR2(A),XB(a)
      • Vars
        • K(b);N_SPINB(a),OGATEB,S_FLIGHT,XS(E)::QAB1(A)
        • K(b);N_SPINB(a),P_SPINP(c),S_FLIGHT::QAB1(A)
      • Refutation
        • P(c);
    • Try
      • B(M);CHECK
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • Q(A);CHECK
      • Vars
        • S(d);P_SPINS(d)::QAR2(A),XB(a)
      • Refutation
        • B(a);P_SPINB(a)
  • Actual
    • S(L);
    • Threat
      • S(L)
    • Vars
      • K(b);OGATEB,S_FLIGHT,XS(L)::B(M)
      • Q(h);N_GUARD,SBLOCK,XS(L)::R1(K),XP(c)
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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).