MESON Chess Problem Database

Problem Display
PID: 263642 (8/8/7Q/1K1p4/1N1R4/8/1kN5/8 w - - 0 1)

Zhezherun, Bogdan Valeriovich

Schweizerische Schachzeitung, 2010

8/8/7Q/1K1p4/1N1R4/8/1kN5/8

#2

5 + 2

SOLUTION

  • SOUND
  • Tries
    • 1.Sa1?
      • 1...Kxa1
        • 2.Qc1#
      • 1...Ka3
        • 2.Qc1#
      • 1...Kc3
        • 2.Qd2#
      • 1...Kb1!
    • 1.Rd3?
      • 1...Kb1
        • 2.Rb3#
      • 1...d4!
    • 1.Qc1+?
      • 1...Kb3
        • 2.Sa1#
        • 2.Rd3#
        • 2.Qa3#
      • 1...Kc3
        • 2.Rd3#
        • 2.Qa3#
      • 1...Kxc1!
    • 1.Qg7?
      • 1...Kb1
        • 2.Rd1#
      • 1...Kb3
        • 2.Rd3#
      • 1...Kc3
        • 2.Rd3#
      • 1...Kc1!
    • 1.Qf6?
      • 1...Kb1
        • 2.Rd1#
      • 1...Kb3
        • 2.Rd3#
      • 1...Kc3
        • 2.Rd3#
      • 1...Kc1!
    • 1.Qh8?
      • 1...Kb1
        • 2.Rd1#
      • 1...Kb3
        • 2.Rd3#
      • 1...Kc3
        • 2.Rd3#
      • 1...Kc1!
  • Keys
    • 1.Qa6!
      • 1...Kb1
        • 2.Qa1#
      • 1...Kc1
        • 2.Qa1#
      • 1...Kb3
        • 2.Qa3#
      • 1...Kc3
        • 2.Qa3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(A);
      • Vars
        • K(a);N_GUARD,S_FLIGHT,XS(A)::QAR2(E)
        • K(a);N_GUARD,S_FLIGHT::QAB(E)
        • K(a);N_GUARD,S_FLIGHT::QAB1(E)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(C);
      • Vars
        • K(a);N_GUARD,P-FLIGHT::R(C)
      • Refutation
        • P(b);
    • Try
      • Q(E);CHECK
      • Refutation
        • K(a);S_FLIGHT,XQ(E)
    • Try
      • Q(E);
      • Vars
        • K(a);N_GUARD,P-FLIGHT,S_CUTP(b)::R(C)
        • K(a);N_GUARD,S_FLIGHT::QAB(E)+R(C),DCHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(a);N_GUARD,P-FLIGHT,S_CUTP(b)::R(C)
        • K(a);N_GUARD,S_FLIGHT::QAB(E)+R(C),DCHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(a);N_GUARD,P-FLIGHT,S_CUTP(b)::R(C)
        • K(a);N_GUARD,S_FLIGHT::QAB(E)+R(C),DCHECK
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(E);
    • Vars
      • K(a);N_GUARD,P-FLIGHT::QAR1(E)
      • K(a);N_GUARD,S_FLIGHT::QAR2(E)
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