MESON Chess Problem Database

Problem Display
PID: 10997 (n7/n7/4Q3/k1K5/p7/8/8/1R6 w - - 0 1)

Speckmann, Werner

Dortmunder General Anzeiger, 1931

n7/n7/4Q3/k1K5/p7/8/8/1R6

#2

3 + 4

3295 Einfuhrung in die Welt des Schachproblem 1984
2786 More Fun with Chess Miniatures 2000
145 StrateGems 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Sb5
      • 2.Rxb5#
    • 1...Sc8
      • 2.Rb5#
    • 1...Sb6
      • 2.Qxb6#
    • 1...Sc7
      • 2.Qb6#
  • Tries
    • 1.Rb6?
      • threat
        • 2.Ra6#
        • 2.Qe1#
      • 1...Sxb6
        • 2.Qxb6#
      • 1...a3
        • 2.Ra6#
      • 1...Sb5
        • 2.Rxb5#
        • 2.Ra6#
      • 1...Sc7
        • 2.Qe1#
      • 1...Sc6!
    • 1.Rb7?
      • threat
        • 2.Rxa7#
      • 1...Sb5
        • 2.Rxb5#
      • 1...Sc8
        • 2.Rb5#
      • 1...Sc7
        • 2.Qb6#
      • 1...Sc6!
  • Keys
    • 1.Qb3!
      • 1...Ka6
        • 2.Qxa4#
      • 1...axb3
        • 2.Ra1#
      • 1...Sb5
        • 2.Qxb5#
      • 1...Sc6
        • 2.Qb5#
      • 1...Sc8
        • 2.Qb5#
      • 1...Sb6
        • 2.Qxb6#
      • 1...Sc7
        • 2.Qb6#
      • 1...a3
        • 2.Qxa3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::R1(A),XS(c)
    • S(c);N_GUARD::R1(A)
    • S(d);N_GUARD::QAB1(C),XS(d)
    • S(d);N_GUARD::QAB1(C)
  • Tries
    • Try
      • R(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(d);OGATE,XR(A)::QAB1(C),XS(d)
        • P(a);::R1(A)
        • S(d);::QAB(C)
      • Refutation
        • S(c);
    • Try
      • R(A);
      • Threat
        • R(A),XS(c)
      • Vars
        • S(c);N_GUARD::R1(A),XS(c)
        • S(c);N_GUARD::R1(A)
        • S(d);N_GUARD::QAB1(C)
      • Refutation
        • S(c);
  • Actual
    • Q(C);
    • Vars
      • K(b);P-FLIGHT::QAR2(C),XP(a)
      • P(a);OGATEB,XQ(C)::R(A)
      • S(c);N_GUARD::QAR1(C),XS(c)
      • S(c);N_GUARD::QAR1(C)
      • S(d);N_GUARD::QAB1(C),XS(d)
      • S(d);N_GUARD::QAB1(C)
      • P(a);OGATEB::QAR2(C),XP(a)
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