MESON Chess Problem Database

Problem Display
PID: 85710 (7k/8/4B2K/6N1/8/8/4b1n1/3n3Q w - - 0 1)

Speckmann, Werner

Deutsche Schachzeitung, 1978

7k/8/4B2K/6N1/8/8/4b1n1/3n3Q

#2

4 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Qa1#
    • 1...Sde3
      • 2.Qa1#
    • 1...Se1
      • 2.Qa8#
    • 1...Sge3
      • 2.Qa8#
    • 1...Sf4
      • 2.Qa8#
    • 1...Sh4
      • 2.Qa8#
  • Tries
    • 1.Kg6+?
      • 1...Bh5+
        • 2.Qxh5#
      • 1...Sh4+!
    • 1.Qxg2?
      • threat
        • 2.Sf7#
        • 2.Qa8#
      • 1...Bf3
        • 2.Sf7#
      • 1...Bg4
        • 2.Qa8#
      • 1...Bb5
        • 2.Sf7#
      • 1...Ba6
        • 2.Sf7#
      • 1...Bh5!
    • 1.Qxd1?
      • threat
        • 2.Qa1#
        • 2.Qd4#
        • 2.Qd8#
      • 1...Bd3
        • 2.Qa1#
      • 1...Bb5
        • 2.Qa1#
        • 2.Qd4#
      • 1...Bh5
        • 2.Qa1#
        • 2.Qd4#
      • 1...Bxd1!
    • 1.Qh2?
      • threat
        • 2.Qe5#
        • 2.Qb8#
      • 1...Bb5
        • 2.Qe5#
      • 1...Bh5
        • 2.Qe5#
      • 1...Ba6
        • 2.Qe5#
      • 1...Sf4!
    • 1.Qh5?
      • threat
        • 2.Qe8#
      • 1...Bb5
        • 2.Kg6#
      • 1...Bxh5!
  • Keys
    • 1.Qg1!
      • threat
        • 2.Qd4#
      • 1...Sf2
        • 2.Qa1#
      • 1...Sde3
        • 2.Qa1#
      • 1...Sge3
        • 2.Sf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • S(a);OGATE::QAB(A)
    • S(c);OGATE::QAB1(A)
  • Tries
    • Try
      • K(D);CHECK,P-FLIGHT
      • Vars
        • B(b);CHECK,N_GUARD,P_SPINB(b)::QAR(A),XB(b)
      • Refutation
        • S(c);CHECK,P_SPINS(c)
    • Try
      • Q(A);XS(c)
      • Threat
        • DUALS(2)
      • Vars
        • B(b);::S(B)
        • B(b);::QAB1(A)
      • Refutation
        • B(b);
    • Try
      • Q(A);XS(a)
      • Threat
        • DUALS(3)
      • Vars
        • B(b);::QAB(A)
      • Refutation
        • B(b);XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(b);::QAB(A)
      • Refutation
        • S(c);
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • B(b);N_GUARD::QAR(A)+K(D)
      • Refutation
        • B(b);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • S(a);OGATE::QAB(A)
      • S(c);::S(B)
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