MESON Chess Problem Database

Problem Display
PID: 164203 (8/8/8/8/1KQp4/8/pk6/1n1R4 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 1996

8/8/8/8/1KQp4/8/pk6/1n1R4

#2

3 + 4

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Ka1
      • 2.Qxd4#
    • 1...Sd2
      • 2.Qc1#
    • 1...Sa3
      • 2.Qb3#
      • 2.Qc1#
    • 1...Sc3
      • 2.Qb3#
    • 1...a1Q
      • 2.Qb3#
    • 1...a1B
      • 2.Qb3#
    • 1...a1R
      • 2.Qb3#
  • Tries
    • 1.Rd2+?
      • 1...Ka1
        • 2.Rxa2#
        • 2.Qxa2#
      • 1...Sxd2!
    • 1.Qe2+?
      • 1...Sd2
        • 2.Qxd2#
      • 1...Ka1!
    • 1.Qxd4+?
      • 1...Sc3
        • 2.Qxc3#
        • 2.Qd2#
      • 1...Kc2!
  • Keys
    • 1.Qd3!
      • 1...Ka1
        • 2.Qxd4#
      • 1...a1Q
        • 2.Qb3#
      • 1...a1S
        • 2.Qxb1#
      • 1...a1B
        • 2.Qxb1#
        • 2.Qb3#
      • 1...a1R
        • 2.Qb3#
      • 1...Sd2
        • 2.Qxd2#
      • 1...Sa3
        • 2.Qb3#
      • 1...Sc3
        • 2.Qd2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(c);P_SPINS(a),S_FLIGHT::QAB(C),XP(d)
    • S(a);::QAB1(C)
    • S(a);::QAR1(C)
    • P(b);SBLOCK::QAR1(C)
  • Tries
    • Try
      • R(A);CHECK
      • Refutation
        • S(a);XR(A)
    • Try
      • Q(C);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR2(C),XS(a)
      • Refutation
        • K(c);P_SPINS(a),S_FLIGHT
    • Try
      • Q(C);CHECK,XP(d)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(C);
    • Vars
      • K(c);P_SPINS(a),S_FLIGHT::QAB(C),XP(d)
      • P(b);SBLOCK::QAR1(C)
      • P(b);N_GUARD::QAR1(C),XS(a)
      • S(a);N_GUARD::QAR2(C),XS(a)
      • S(a);::QAR1(C)
      • S(a);N_GUARD::QAR2(C)
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