MESON Chess Problem Database

Problem Display
PID: 160660 (8/8/8/8/1N1K4/3Q4/pk6/1n2R3 w - - 0 1)

Andreev, Aleksandr Grigorevich

Bankovskaya gazeta, 1996

8/8/8/8/1N1K4/3Q4/pk6/1n2R3

#2

4 + 3

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Ka1
      • 2.Qc3#
    • 1...Sd2
      • 2.Qc3#
    • 1...Sa3
      • 2.Qc3#
    • 1...Sc3
      • 2.Qxc3#
    • 1...a1S
      • 2.Rxb1#
    • 1...a1B
      • 2.Rxb1#
  • Tries
    • 1.Rxb1+?
      • 1...axb1Q
        • 2.Qc3#
      • 1...axb1B
        • 2.Qc3#
      • 1...axb1R
        • 2.Qc3#
      • 1...axb1S!
    • 1.Re2+?
      • 1...Ka1
        • 2.Rxa2#
      • 1...Kc1
        • 2.Sxa2#
        • 2.Rc2#
        • 2.Qc2#
      • 1...Sd2!
    • 1.Qc2+?
      • 1...Ka1
        • 2.Qxa2#
        • 2.Qc3#
      • 1...Ka3!
    • 1.Qb3+?
      • 1...Ka1
        • 2.Sc2#
        • 2.Qxa2#
        • 2.Qc3#
      • 1...Kxb3!
  • Keys
    • 1.Rc1!
      • 1...Ka1
        • 2.Qc3#
      • 1...Kxc1
        • 2.Qc2#
      • 1...Sc3
        • 2.Qxc3#
      • 1...a1Q
        • 2.Rc2#
      • 1...a1S
        • 2.Rxb1#
      • 1...a1B
        • 2.Rxb1#
        • 2.Rc2#
      • 1...a1R
        • 2.Rc2#
      • 1...Sd2
        • 2.Qc3#
      • 1...Sa3
        • 2.Qc3#

FEATURES

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