MESON Chess Problem Database

Problem Display
PID: 276888 (8/2p1N3/1r6/8/1P1kNP1n/1P1p1p2/7K/3nQ3 w - - 0 1)

Helledie, Holger

Stella Polaris, 1971

8/2p1N3/1r6/8/1P1kNP1n/1P1p1p2/7K/3nQ3

#2

7 + 7

SOLUTION

  • SOUND
  • Tries
    • 1.Sc3?
      • threat
        • 2.Qe5#
      • 1...d2
        • 2.Qxd2#
      • 1...Rb5
        • 2.Sxb5#
        • 2.Sc6#
      • 1...Re6
        • 2.Sb5#
      • 1...Sg6
        • 2.Sf5#
      • 1...Se3!
    • 1.Sc5?
      • threat
        • 2.Qe5#
      • 1...Re6
        • 2.Sxe6#
      • 1...Se3
        • 2.Qa1#
      • 1...Sg6!
    • 1.Sd6?
      • threat
        • 2.Qe5#
      • 1...d2
        • 2.Qxd2#
      • 1...Rb5
        • 2.Sxb5#
      • 1...Se3
        • 2.Qa1#
      • 1...Sg6
        • 2.Sdf5#
      • 1...cxd6!
    • 1.Sf6?
      • threat
        • 2.Qe5#
      • 1...d2
        • 2.Qxd2#
      • 1...Rb5
        • 2.Sc6#
      • 1...Se3
        • 2.Qa1#
      • 1...Sg6
        • 2.Sf5#
      • 1...Re6!
  • Keys
    • 1.Sg5!
      • threat
        • 2.Qe5#
      • 1...d2
        • 2.Qxd2#
      • 1...Rb5
        • 2.Se6#
      • 1...Re6
        • 2.Sxe6#
      • 1...Se3
        • 2.Qa1#
      • 1...Sg6
        • 2.Sxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(E);
      • Threat
        • QAB1(A)
      • Vars
        • P(b);OGATEB::QAR2(A),XP(b)
        • R(f);N_GUARD::S(E)
        • S(e);N_GUARD::S(G)
      • Refutation
        • S(a);
    • Try
      • S(E);
      • Threat
        • QAB1(A)
      • Vars
        • R(f);N_GUARD::S(E),XR(f)
        • S(a);OGATE,SBLOCK::QAB(A)
      • Refutation
        • S(e);
    • Try
      • S(E);
      • Threat
        • QAB1(A)
      • Vars
        • P(b);OGATEB::QAR2(A),XP(b)
        • R(f);N_GUARD::S(E),XR(f)
        • S(a);OGATE,SBLOCK::QAB(A)
        • S(e);N_GUARD::S(E)
      • Refutation
        • P(g);XS(E)
    • Try
      • S(E);
      • Threat
        • QAB1(A)
      • Vars
        • P(b);OGATEB::QAR2(A),XP(b)
        • R(f);N_GUARD::S(G)
        • S(a);OGATE,SBLOCK::QAB(A)
        • S(e);N_GUARD::S(G)
      • Refutation
        • R(f);
  • Actual
    • S(E);
    • Threat
      • QAB1(A)
    • Vars
      • P(b);OGATEB::QAR2(A),XP(b)
      • R(f);N_GUARD::S(E)
      • R(f);N_GUARD::S(E),XR(f)
      • S(a);OGATE,SBLOCK::QAB(A)
      • S(e);N_GUARD::S(E),XP(c)
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