MESON Chess Problem Database

Problem Display
PID: 172223 (8/8/8/8/2K5/p1Q5/1p6/rk1N4 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 1996

8/8/8/8/2K5/p1Q5/1p6/rk1N4

#2

3 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...a2
      • 2.Qxb2#
  • Tries
    • 1.Se3?
      • 1...Ra2
        • 2.Qe1#
      • 1...a2
        • 2.Qe1#
        • 2.Qc2#
      • 1...Ka2!
    • 1.Qd2?
      • threat
        • 2.Sc3#
      • 1...Ka2
        • 2.Sc3#
      • 1...Ra2!
    • 1.Qc2+?
      • 1...Ka2
        • 2.Sc3#
      • 1...Kxc2!
    • 1.Qd3+?
      • 1...Ka2
        • 2.Sc3#
      • 1...Kc1!
  • Keys
    • 1.Qe1!
      • 1...Kc1
        • 2.Se3#
      • 1...Ka2
        • 2.Sc3#
      • 1...Kc2
        • 2.Se3#
      • 1...Ra2
        • 2.Se3#
      • 1...a2
        • 2.Se3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(d);N_GUARD::QAR1(B),XP(c)
  • Tries
    • Try
      • S(A);
      • Vars
        • R(a);SBLOCK::QAR(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);
      • Threat
        • S(A)
      • Vars
        • K(b);P_SPINP(c),S_FLIGHT::S(A)
      • Refutation
        • R(a);
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P_SPINP(c),S_FLIGHT::S(A)
      • Refutation
        • K(b);S_FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT::S(A)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(b);P-FLIGHT::QAR(B)+S(A)
      • K(b);S_FLIGHT::S(A)
      • R(a);SBLOCK::QAR(B)+S(A)
      • P(d);SBLOCK::QAR(B)+S(A)
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