MESON Chess Problem Database

Problem Display
PID: 85861 (8/N4p2/8/6r1/k7/8/KR6/7Q w - - 0 1)

Speckmann, Werner

Shakhmatna misl, 1966

8/N4p2/8/6r1/k7/8/KR6/7Q

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra5
      • 2.Qe4#
      • 2.Qd1#
      • 2.Qh4#
  • Tries
    • 1.Qf3?
      • threat
        • 2.Qa3#
      • 1...Ka5
        • 2.Qa3#
      • 1...Rg3!
    • 1.Qc6+?
      • 1...Rb5
        • 2.Qxb5#
      • 1...Ka5!
    • 1.Qb7?
      • threat
        • 2.Qb4#
      • 1...Rg4
        • 2.Qa6#
        • 2.Qb5#
      • 1...Rb5
        • 2.Qxb5#
      • 1...Ka5!
    • 1.Qh3?
      • threat
        • 2.Qa3#
      • 1...Ka5
        • 2.Qa3#
      • 1...Rg3!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Sb5#
      • 1...Ka5
        • 2.Sc6#
        • 2.Sc8#
      • 1...Ra5
        • 2.Qe4#
      • 1...Rb5
        • 2.Sxb5#
      • 1...Rg6
        • 2.Sc6#
      • 1...Rg8
        • 2.Sc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
      • Refutation
        • R(b);
    • Try
      • Q(A);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB1(A),XR(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • R(b);N_GUARD::QAB1(A),XR(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
      • Refutation
        • R(b);
  • Actual
    • Q(A);
    • Threat
      • QAR(A)+S(D)
    • Vars
      • R(b);SBLOCK::QAR(A)
      • R(b);::QAR(A)+S(D),XR(b)
      • R(b);N_GUARD::QAR(A)+S(D)
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