MESON Chess Problem Database

Problem Display
PID: 61888 (8/4pQ2/3p1P1K/Np6/1B1knP2/r3p1p1/2rp2B1/2N5 w - - 0 1)

Gfeller, Heinz

Deutsche Schachblatter, 1962

8/4pQ2/3p1P1K/Np6/1B1knP2/r3p1p1/2rp2B1/2N5

#2

8 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rca2
      • 2.Sc6#
    • 1...Rb2
      • 2.Sc6#
    • 1...Rc6
      • 2.Sxc6#
    • 1...Ra1
      • 2.Sab3#
    • 1...Raa2
      • 2.Sab3#
    • 1...Rb3
      • 2.Saxb3#
    • 1...Rd3
      • 2.Se2#
    • 1...Ra4
      • 2.Sab3#
    • 1...Sf2
      • 2.Qd5#
    • 1...Sc3
      • 2.Sc6#
    • 1...Sc5
      • 2.Sc6#
      • 2.Qd5#
    • 1...Sg5
      • 2.Qd5#
  • Tries
    • 1.Qe6?
      • threat
        • 2.Qxe4#
      • 1...Sf2
        • 2.Qd5#
      • 1...Sc3
        • 2.Sc6#
      • 1...Sc5
        • 2.Sc6#
        • 2.Qd5#
      • 1...Sg5
        • 2.Qd5#
      • 1...d5
        • 2.Qe5#
      • 1...Sxf6!
    • 1.Qg6?
      • threat
        • 2.Qxe4#
      • 1...Kd5
        • 2.Qxe4#
      • 1...Sxf6
        • 2.Se2#
      • 1...Sf2
        • 2.Se2#
      • 1...Sc3
        • 2.Qd3#
      • 1...Sc5
        • 2.Se2#
      • 1...Sg5
        • 2.Se2#
      • 1...d5!
    • 1.Qh7?
      • threat
        • 2.Qxe4#
      • 1...Kd5
        • 2.Qxe4#
      • 1...Sxf6
        • 2.Se2#
      • 1...Sf2
        • 2.Se2#
      • 1...Sc3
        • 2.Qd3#
      • 1...Sc5
        • 2.Se2#
      • 1...Sg5
        • 2.Se2#
      • 1...d5!
  • Keys
    • 1.Qxe7!
      • threat
        • 2.Qxe4#
      • 1...Kd5
        • 2.Qxd6#
        • 2.Qxe4#
      • 1...Sxf6
        • 2.Qxf6#
      • 1...Sf2
        • 2.Qxd6#
      • 1...Sc3
        • 2.Qa7#
      • 1...Sc5
        • 2.Qxd6#
      • 1...Sg5
        • 2.Qxd6#
      • 1...d5
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • R(a);N_GUARD::S(E)
    • R(a);N_GUARD::S(E),XR(a)
    • R(c);N_GUARD::S(E)
    • R(c);N_GUARD::S(E),XR(c)
    • R(c);SBLOCK::S(A)
    • S(g);::QAR1(H)
    • S(g);S_CUTR(a)::S(E)
  • Tries
    • Try
      • Q(H);
      • Threat
        • QAR1(H),XS(g)
      • Vars
        • S(g);::QAR1(H)
        • S(g);S_CUTR(a)::S(E)
        • P(i);N_GUARD::QAB1(H)
      • Refutation
        • S(g);XP(F)
    • Try
      • Q(H);
      • Threat
        • QAR1(H),XS(g)
      • Vars
        • K(f);P-FLIGHT,P_SPINS(g)::QAB1(H),XS(g)
        • S(g);XP(F)::S(A)
        • S(g);::S(A)
        • S(g);OGATE::QAR1(H)
      • Refutation
        • P(i);
    • Try
      • Q(H);
      • Threat
        • QAR1(H),XS(g)
      • Vars
        • K(f);P-FLIGHT,P_SPINS(g)::QAB1(H),XS(g)
        • S(g);XP(F)::S(A)
        • S(g);::S(A)
        • S(g);OGATE::QAR1(H)
      • Refutation
        • P(i);
  • Actual
    • Q(H);XP(j)
    • Threat
      • QAR1(H),XS(g)
    • Vars
      • S(g);OGATE,XP(F)::QAB(H),XS(g)
      • S(g);N_GUARD::QAR2(H),XP(i)
      • S(g);N_GUARD,S_CUTR(a)::QAB(H)
      • P(i);N_GUARD::QAB1(H)
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