MESON Chess Problem Database

Problem Display
PID: 18947 (6B1/8/8/4K3/8/1n1N4/8/kb5Q w - - 0 1)

Nestorescu, Virgil

3rd Prize, Shakhmaty v SSSR, 1959

6B1/8/8/4K3/8/1n1N4/8/kb5Q

#2

4 + 3

2012 Miniature Chess Problems from Many Countries 1981
3295 Einfuhrung in die Welt des Schachproblem 1984
3310 2345 Chess Problems 1997
4764 Probleme si studii alese 1999
56 The Problemist 2004
5929 Mat Plus Special Issue 2006
3713 Snap 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ka2
      • 2.Qa8#
  • Tries
    • 1.Kf4?
      • 1...Ka2
        • 2.Qa8#
      • 1...Sc1
        • 2.Qh8#
      • 1...Sd2
        • 2.Qh8#
      • 1...Sa5
        • 2.Qh8#
      • 1...Sc5
        • 2.Qh8#
      • 1...Sd4!
    • 1.Kf5?
      • 1...Ka2
        • 2.Qa8#
      • 1...Sc1
        • 2.Qh8#
      • 1...Sd2
        • 2.Qh8#
      • 1...Sa5
        • 2.Qh8#
      • 1...Sc5
        • 2.Qh8#
      • 1...Sd4+!
    • 1.Kd6?
      • 1...Ka2
        • 2.Qa8#
      • 1...Sc1
        • 2.Qh8#
      • 1...Sd2
        • 2.Qh8#
      • 1...Sa5
        • 2.Qh8#
      • 1...Sc5
        • 2.Qh8#
      • 1...Sd4!
    • 1.Qc1?
      • threat
        • 2.Qb2#
      • 1...Ka2
        • 2.Qb2#
      • 1...Sxc1!
    • 1.Qe1?
      • 1...Ka2
        • 2.Qa5#
      • 1...Sd4
        • 2.Qc3#
      • 1...Sc1
        • 2.Qc3#
      • 1...Sa5
        • 2.Qc3#
      • 1...Sc5
        • 2.Qc3#
      • 1...Sd2!
  • Keys
    • 1.Qg1!
      • 1...Ka2
        • 2.Qa7#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sc1
        • 2.Qd4#
      • 1...Sd2
        • 2.Qd4#
      • 1...Sa5
        • 2.Qd4#
      • 1...Sc5
        • 2.Qd4#

Anticipated by 123650(0000)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(a);N_SPINB(b),P-FLIGHT,P_SPINS(c)::QAR(A)
  • Tries
    • Try
      • K(C);S_FLIGHT
      • Vars
        • K(a);N_SPINB(b),P-FLIGHT,P_SPINS(c)::QAR(A)
        • S(c);N_GUARD,N_SPINB(b)::QAB(A)
        • S(c);N_GUARD::QAB(A)
      • Refutation
        • S(c);
    • Try
      • K(C);P-FLIGHT,P_SPINS(B)
      • Vars
        • K(a);N_SPINB(b),P-FLIGHT,P_SPINS(c)::QAR(A)
        • S(c);N_GUARD,N_SPINB(b)::QAB(A)
        • S(c);N_GUARD::QAB(A)
      • Refutation
        • S(c);CHECK
    • Try
      • K(C);S_FLIGHT
      • Vars
        • K(a);N_SPINB(b),P-FLIGHT,P_SPINS(c)::QAR(A)
        • S(c);N_GUARD,N_SPINB(b)::QAB(A)
        • S(c);N_GUARD::QAB(A)
      • Refutation
        • S(c);
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • K(a);N_SPINB(b),P-FLIGHT,P_SPINS(c)::QAR1(A)
      • Refutation
        • S(c);N_SPINB(b),XQ(A)
    • Try
      • Q(A);
      • Vars
        • K(a);N_SPINB(b),P-FLIGHT,P_SPINS(c)::QAR(A)
        • S(c);::QAB(A)
        • S(c);N_SPINB(b)::QAB(A)
      • Refutation
        • S(c);
  • Actual
    • Q(A);
    • Vars
      • K(a);N_SPINB(b),P-FLIGHT,P_SPINS(c)::QAR(A)
      • S(c);N_GUARD::QAB(A),XS(c)
      • S(c);N_GUARD,N_SPINB(b)::QAB(A)
      • S(c);N_GUARD::QAB(A)
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