MESON Chess Problem Database

Problem Display
PID: 172419 (8/8/8/1K6/2Q5/7R/nk6/R1n5 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 1997

8/8/8/1K6/2Q5/7R/nk6/R1n5

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Se2
      • 2.Qxa2#
    • 1...Sc3+
      • 2.Qxc3#
    • 1...Sb4
      • 2.Qxc1#
      • 2.Qc3#
  • Tries
    • 1.Rxa2+?
      • 1...Kb1
        • 2.Qc2#
      • 1...Sxa2!
    • 1.Qd4+?
      • 1...Sc3+
        • 2.Qxc3#
      • 1...Kc2!
  • Keys
    • 1.Ra3!
      • 1...Sc3+
        • 2.Qxc3#
      • 1...Kxa1
        • 2.Qxc1#
      • 1...Kxa3
        • 2.Qb4#
      • 1...Se2
        • 2.R3xa2#
        • 2.Qxa2#
      • 1...Sb3
        • 2.R3xa2#
      • 1...Sd3
        • 2.R3xa2#
        • 2.Qxa2#
      • 1...Sb4
        • 2.Qxc1#
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • S(a);N_GUARD::QAR1(C),XS(b)
    • S(b);CHECK,N_GUARD::QAB1(C),XS(b)
  • Tries
    • Try
      • R(A);CHECK,XS(b)
      • Vars
        • K(c);P-FLIGHT::QAB1(C)
      • Refutation
        • S(a);XR(A)
    • Try
      • Q(C);CHECK
      • Vars
        • S(b);CHECK,N_GUARD,P_SPINS(b)::QAB1(C),XS(b)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • R(B);
    • Vars
      • S(b);CHECK,N_GUARD::QAB1(C),XS(b)
      • K(c);P_SPINS(b),S_FLIGHT,XR(A)::QAR2(C),XS(a)
      • K(c);P_SPINS(b),S_FLIGHT,XR(B)::QAB1(C)
      • S(a);N_GUARD::R1(B),XS(b)
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