MESON Chess Problem Database

Problem Display
PID: 240594 (8/1q6/5pPR/2NQpk2/3P4/1b3NK1/8/8 w - - 0 1)

Groeneveld, Cornelis

Thema Danicum, 1983

8/1q6/5pPR/2NQpk2/3P4/1b3NK1/8/8

#2

7 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Qe4#
    • 1...Qc8
      • 2.Qe4#
    • 1...Qb4
      • 2.Qe4#
    • 1...Qb5
      • 2.Qe4#
    • 1...Qb6
      • 2.Qe4#
    • 1...Qa7
      • 2.Qe4#
    • 1...Qc7
      • 2.Qe4#
    • 1...Qd7
      • 2.Qe4#
    • 1...Qe7
      • 2.Qe4#
    • 1...Qf7
      • 2.Qe4#
    • 1...Qg7
      • 2.Qe4#
    • 1...Qh7
      • 2.Qe4#
    • 1...Qb8
      • 2.Qe4#
    • 1...Bd1
      • 2.Qe6#
    • 1...Bc2
      • 2.Qe6#
    • 1...Ba4
      • 2.Qe6#
  • Tries
    • 1.Qxb7?
      • threat
        • 2.Qe4#
      • 1...Bc2
        • 2.Qc8#
        • 2.Qd7#
      • 1...e4
        • 2.Qxe4#
      • 1...Bd5!
    • 1.Qd7+?
      • 1...Be6
        • 2.Qxe6#
      • 1...Qxd7!
  • Keys
    • 1.Sxe5!
      • threat
        • 2.Rh5#
      • 1...Kg5
        • 2.Sf7#
      • 1...fxe5
        • 2.Qxe5#
      • 1...Qh7
        • 2.Sc4#
      • 1...Bd1
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 14
  • Sets
    • Q(e);N_GUARD::QAB1(E)
    • Q(e);N_GUARD,P_PINP(F)::QAB1(E)
    • B(a);N_GUARD::QAB1(E)
  • Tries
    • Try
      • Q(E);N_PINP(b),XQ(e)
      • Threat
        • QAB1(E)
      • Vars
        • P(b);::QAB1(E),XP(b)
      • Refutation
        • B(a);
    • Try
      • Q(E);CHECK,N_PINP(b)
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAB1(E),XB(a)
      • Refutation
        • Q(e);XQ(E)
  • Actual
    • S(A);XP(b)
    • Threat
      • R(G)
    • Vars
      • K(c);P-FLIGHT::QAR(E)+S(A),DCHECK
      • P(d);OGATE,P_SPINP(d),XS(A)::QAR1(E),XP(d)
      • Q(e);N_GUARD::QAR(E)+S(A)
      • B(a);N_GUARD::QAR(E)+S(A)
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