MESON Chess Problem Database

Problem Display
PID: 10896 (2n5/p2Q1bK1/P2P1P2/n1Pk2NR/1R2N3/3p4/5Pq1/B6B w - - 0 1)

Hoffmann, Fritz

1st HM., Schach, 1969

2n5/p2Q1bK1/P2P1P2/n1Pk2NR/1R2N3/3p4/5Pq1/B6B

#2

13 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qf1
      • 2.Sxf7#
    • 1...Qxe4
      • 2.Sxf7#
    • 1...Qxg5+
      • 2.Rxg5#
    • 1...Sb3
      • 2.Qb7#
    • 1...Sc4
      • 2.Qb7#
    • 1...Sc6
      • 2.Qxf7#
    • 1...Sb7
      • 2.Qxb7#
    • 1...Sxd6
      • 2.Qxd6#
    • 1...Se7
      • 2.dxe7#
  • Tries
    • 1.Sc3+?
      • 1...Ke5
        • 2.f4#
      • 1...Kxc5!
    • 1.Bd4?
      • threat
        • 2.Sc3#
      • 1...Qxg5+
        • 2.Sxg5#
        • 2.Rxg5#
      • 1...Qxe4
        • 2.Sxf7#
        • 2.Bxe4#
      • 1...Sc4!
    • 1.Qb7+?
      • 1...Sc6
        • 2.Qxf7#
      • 1...Sxb7!
  • Keys
    • 1.Qb5!
      • threat
        • 2.c6#
      • 1...Qxg5+
        • 2.Sxg5#
      • 1...Qxe4
        • 2.Bxe4#
      • 1...Qxf2
        • 2.Sxf2#
      • 1...Sxd6
        • 2.cxd6#
      • 1...Sb3
        • 2.Qb7#
      • 1...Sc6
        • 2.Qc4#
      • 1...Sb7
        • 2.Qxb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • Q(a);N_PINS(G)::R(H)+S(G),XB(f)
    • Q(a);N_PINS(G),P_SPINQ(a),XS(E)::R(H)+S(G),XB(f)
    • Q(a);CHECK,OGATE,P_SPINQ(a),XS(G)::R(H),XQ(a)
    • S(c);N_GUARD::QAB(L)
    • S(c);SBLOCK::QAB(L),XB(f)
    • S(c);N_GUARD::QAB(L),XS(c)
    • S(g);OGATE,P_SPINS(g),XP(J)::QAR1(L),XS(g)
    • S(g);OGATE::QAR(L)+P(J),XS(g)
  • Tries
    • Try
      • S(E);CHECK,P_PINQ(a)
      • Vars
        • K(d);N_SPINQ(a),P-FLIGHT::P(C)
      • Refutation
        • K(d);N_SPINQ(a),P-FLIGHT,XP(F)
    • Try
      • B(A);
      • Threat
        • S(E)
      • Refutation
        • S(c);
    • Try
      • Q(L);CHECK
      • Vars
        • S(c);P_SPINS(c),SBLOCK::QAB(L),XB(f)
      • Refutation
        • S(c);XQ(L)
  • Actual
    • Q(L);
    • Threat
      • QAR(L)+P(F)
    • Vars
      • Q(a);CHECK,P_SPINQ(a),XS(G)::B(B)+S(E),XQ(a)
      • Q(a);N_PINS(G),OGATE,P_SPINQ(a),XS(E)::B(B),XQ(a)
      • Q(a);N_PINS(G),XP(C)::B(B)+S(E),XQ(a)
      • S(g);OGATE,XP(J)::QAR(L)+P(F),XS(g)
      • S(c);N_GUARD::QAB(L)
      • S(c);N_GUARD,SBLOCK::QAB1(L)
      • S(c);N_GUARD::QAB(L),XS(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).