MESON Chess Problem Database

Problem Display
PID: 85773 (k7/2K2b2/2N5/1N6/4Q3/1q4p1/8/8 w - - 0 1)

Speckmann, Werner

To Mat, 1961

k7/2K2b2/2N5/1N6/4Q3/1q4p1/8/8

#2

4 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa4
      • 2.Qxa4#
    • 1...Qd5
      • 2.Qa4#
    • 1...Qe6
      • 2.Qa4#
    • 1...Qb1
      • 2.Qa4#
    • 1...Qb2
      • 2.Qa4#
    • 1...Qd3
      • 2.Qa4#
    • 1...Qf3
      • 2.Qa4#
    • 1...Bc4
      • 2.Qe8#
    • 1...Bd5
      • 2.Qe8#
    • 1...Be8
      • 2.Qxe8#
    • 1...Bg8
      • 2.Qe8#
  • Tries
    • 1.Sb4+?
      • 1...Bd5
        • 2.Qe8#
      • 1...Qd5!
    • 1.Scd4+?
      • 1...Bd5
        • 2.Qe8#
      • 1...Qd5!
    • 1.Sa5+?
      • 1...Bd5
        • 2.Qe8#
      • 1...Qd5!
    • 1.Se5+?
      • 1...Qd5
        • 2.Qa4#
      • 1...Bd5!
    • 1.Sca7+?
      • 1...Bd5
        • 2.Qe8#
      • 1...Qd5!
    • 1.Se7+?
      • 1...Qd5
        • 2.Qa4#
      • 1...Bd5!
    • 1.Sb8+?
      • 1...Qd5
        • 2.Qa4#
      • 1...Bd5!
    • 1.Sd8+?
      • 1...Qd5
        • 2.Qa4#
      • 1...Bd5!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Qa7#
        • 2.Qd8#
      • 1...Qxb5
        • 2.Qa7#
      • 1...Qd5
        • 2.Qa7#
        • 2.Qa4#
      • 1...Qd1
        • 2.Qa7#
      • 1...Qa2
        • 2.Qd8#
      • 1...Qa4
        • 2.Qxa4#
        • 2.Qd8#
      • 1...Qe6
        • 2.Qa7#
        • 2.Qa4#
      • 1...Qa3
        • 2.Qd8#
      • 1...Qd3
        • 2.Qa7#
        • 2.Qa4#
      • 1...Qe3
        • 2.Qd8#
      • 1...Bd5
        • 2.Qa7#
      • 1...Be6
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 10
  • Sets
    • Q(a);N_GUARD::QAR(A),XQ(a)
    • Q(a);N_GUARD::QAR(A)
    • B(c);N_GUARD::QAR(A)
    • B(c);N_GUARD::QAR(A),XB(c)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAR(A)
      • Refutation
        • Q(a);P_SPINQ(a)
    • Try
      • S(C);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAR(A)
      • Refutation
        • Q(a);P_SPINQ(a)
    • Try
      • S(C);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAR(A)
      • Refutation
        • Q(a);P_SPINQ(a)
    • Try
      • S(C);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAR(A)
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • S(C);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAR(A)
      • Refutation
        • Q(a);P_SPINQ(a)
    • Try
      • S(C);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAR(A)
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • S(C);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAR(A)
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • S(C);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAR(A)
      • Refutation
        • B(c);P_SPINB(c)
  • Actual
    • Q(A);
    • Threat
      • DUALS(2)
    • Vars
      • Q(a);XS(B)::QAR1(A)
      • Q(a);::QAR1(A)
      • Q(a);::QAR(A)
      • B(c);::QAR1(A)
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