MESON Chess Problem Database

Problem Display
PID: 6645 (N7/8/4K3/2k1n3/Q7/1P6/1P6/8 w - - 0 1)

Onitiu, Valerian

Magyar Sakkvilag, 1932

N7/8/4K3/2k1n3/Q7/1P6/1P6/8

#2

5 + 2

273 Mat Plus 1995

SOLUTION

  • SOUND
  • Sets
    • 1...Sd3
      • 2.Qc4#
    • 1...Sf3
      • 2.Qc4#
    • 1...Sc4
      • 2.Qxc4#
    • 1...Sg4
      • 2.Qc4#
    • 1...Sc6
      • 2.Qc4#
    • 1...Sg6
      • 2.Qc4#
    • 1...Sd7
      • 2.Qc4#
    • 1...Sf7
      • 2.Qc4#
  • Tries
    • 1.Qb4+?
      • 1...Kc6
        • 2.Qb6#
      • 1...Kxb4!
    • 1.Qd4+?
      • 1...Kb5
        • 2.Qb6#
      • 1...Kc6
        • 2.Qb6#
        • 2.Qd5#
      • 1...Kxd4!
    • 1.Qe4?
      • 1...Sc4
        • 2.Qxc4#
      • 1...Sd3
        • 2.Qc4#
      • 1...Sf3
        • 2.Qc4#
      • 1...Sg4
        • 2.Qc4#
      • 1...Sc6
        • 2.Qc4#
      • 1...Sg6
        • 2.Qc4#
      • 1...Sd7
        • 2.Qc4#
      • 1...Sf7
        • 2.Qc4#
      • 1...Kb5!
    • 1.Qa5+?
      • 1...Kc6
        • 2.Qb6#
        • 2.Qd5#
      • 1...Kd4!
    • 1.Qa6?
      • threat
        • 2.Qb6#
      • 1...Kb4
        • 2.Qb6#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Sd7
        • 2.Qc4#
      • 1...Kd4!
  • Keys
    • 1.Qa7+!
      • 1...Kb4
        • 2.Qb6#
      • 1...Kb5
        • 2.Qb6#
      • 1...Kc6
        • 2.Qb6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • S(b);N_GUARD::QAR1(C)
    • S(b);N_GUARD::QAR1(C),XS(b)
    • S(b);N_GUARD,SBLOCK::QAR1(C)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT,XQ(C)
    • Try
      • Q(C);
      • Vars
        • S(b);N_GUARD::QAR1(C),XS(b)
        • S(b);N_GUARD::QAR1(C)
        • S(b);N_GUARD,SBLOCK::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • K(a);S_FLIGHT::QAR2(C)
        • S(b);N_GUARD::QAR1(C),XS(b)
        • S(b);N_GUARD::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(C);CHECK
    • Vars
      • K(a);S_FLIGHT::QAR2(C)
      • K(a);P-FLIGHT::QAR1(C)
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