MESON Chess Problem Database

Problem Display
PID: 238649 (8/8/K3B3/8/3Q4/1N6/k3P3/7r w - - 0 1)

Subotic, Miroslav

Die Schwalbe, 1970

8/8/K3B3/8/3Q4/1N6/k3P3/7r

#2

5 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qxa1#
    • 1...Rh2
      • 2.Qa1#
    • 1...Rh3
      • 2.Qa1#
    • 1...Rh4
      • 2.Qa1#
    • 1...Rh5
      • 2.Qa1#
    • 1...Rh6
      • 2.Qa1#
    • 1...Rh7
      • 2.Qa1#
    • 1...Rh8
      • 2.Qa1#
  • Tries
    • 1.Sa1+?
      • 1...Ka3
        • 2.Sc2#
      • 1...Kb1!
    • 1.Sc5+?
      • 1...Ka3
        • 2.Qc3#
      • 1...Kb1!
    • 1.Qd2+?
      • 1...Kb1
        • 2.Bf5#
      • 1...Ka3!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Sd2#
      • 1...Kb1
        • 2.Sd2#
      • 1...Ka3
        • 2.Sc5#
      • 1...Rb1
        • 2.Sc1#
      • 1...Rh4
        • 2.Qa1#
      • 1...Rh5
        • 2.Qa1#
      • 1...Rh6
        • 2.Qa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • R(a);N_GUARD::QAR1(C),XR(a)
    • R(a);N_GUARD,SBLOCK::QAR1(C)
    • R(a);N_GUARD::QAR1(C)
    • R(a);N_GUARD,P_PINB(E)::QAR1(C)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(b);P-FLIGHT::S(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR2(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);S_FLIGHT::B(E)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(C);
    • Threat
      • B(E)+S(B)
    • Vars
      • K(b);S_FLIGHT::S(B)
      • K(b);P-FLIGHT::QAR(C)+S(B)
      • R(a);SBLOCK::B(E)+S(B),DCHECK
      • R(a);N_GUARD::QAR1(C)
      • R(a);N_GUARD,P_PINB(E)::QAR1(C)
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