MESON Chess Problem Database

Problem Display
PID: 166880 (4RQ2/8/n1p5/1k6/2N5/2K5/8/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 1996

4RQ2/8/n1p5/1k6/2N5/2K5/8/8

#2

4 + 3

15148 Sadier Collection 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Re5+?
      • 1...Ka4
        • 2.Sb2#
        • 2.Sb6#
        • 2.Ra5#
        • 2.Qa3#
      • 1...c5
        • 2.Qe8#
      • 1...Sc5!
    • 1.Rb8+?
      • 1...Ka4
        • 2.Qa3#
      • 1...Sxb8!
    • 1.Qc5+?
      • 1...Ka4
        • 2.Sb2#
        • 2.Sb6#
        • 2.Qa5#
        • 2.Qxc6#
      • 1...Kxc5
        • 2.Re5#
      • 1...Sxc5!
    • 1.Qf5+?
      • 1...Ka4
        • 2.Qa5#
      • 1...c5
        • 2.Qd7#
      • 1...Sc5!
  • Keys
    • 1.Ra8!
      • 1...Ka4
        • 2.Qb4#
      • 1...c5
        • 2.Qe8#
      • 1...Sb4
        • 2.Ra5#
        • 2.Qxb4#
      • 1...Sc5
        • 2.Ra5#
      • 1...Sc7
        • 2.Ra5#
        • 2.Qb4#
      • 1...Sb8
        • 2.Ra5#
        • 2.Qb4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • P(c);P_SPINP(c),S_CUTS(b)::QAB(D)
      • Refutation
        • S(b);P_SPINS(b)
    • Try
      • R(C);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR1(D)
      • Refutation
        • S(b);XR(C)
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);P-FLIGHT,XQ(D)::R(C)
      • Refutation
        • S(b);XQ(D)
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(D)
        • P(c);OGATEB,P_SPINP(c),SBLOCK::QAB(D)
      • Refutation
        • S(b);P_SPINS(b)
  • Actual
    • R(C);
    • Vars
      • K(a);P_SPINS(b),S_FLIGHT::QAR1(D)
      • P(c);OGATEB,SBLOCK::QAB(D)
      • S(b);OGATE::R1(C)
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