MESON Chess Problem Database

Problem Display
PID: 171344 (8/2p5/2K5/3P4/1k6/p7/Q7/1N6 w - - 0 1)

Antipov, Viacheslav Pavlovich

Temp-64 (Nikolaev), 1995

8/2p5/2K5/3P4/1k6/p7/Q7/1N6

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ka4
      • 2.Qxa3#
    • 1...Ka5
      • 2.Qxa3#
  • Tries
    • 1.Sxa3?
      • 1...Ka4
        • 2.Sc2#
      • 1...Ka5
        • 2.Sc2#
      • 1...Kc3!
    • 1.Sc3?
      • 1...Ka5
        • 2.Qxa3#
      • 1...Kxc3!
    • 1.Qb3+?
      • 1...Ka5
        • 2.Qxa3#
        • 2.Qb5#
      • 1...Kxb3!
    • 1.Qc4+?
      • 1...Ka5
        • 2.Qb5#
      • 1...Kxc4!
    • 1.Qb2+?
      • 1...Ka4
        • 2.Qxa3#
        • 2.Qb5#
      • 1...Kc4
        • 2.Qc3#
      • 1...Ka5
        • 2.Qxa3#
        • 2.Qb5#
      • 1...axb2!
    • 1.Qe2?
      • threat
        • 2.Qb5#
      • 1...Ka4
        • 2.Qb5#
      • 1...Ka5
        • 2.Qb5#
      • 1...Kb3!
    • 1.d6?
      • 1...Ka4
        • 2.Qxa3#
      • 1...Ka5
        • 2.Qxa3#
      • 1...cxd6!
  • Keys
    • 1.Qxa3+!
      • 1...Kc4
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • K(b);P-FLIGHT,P_SPINP(a)::QAR1(B),XP(a)
    • K(b);P_SPINP(a),S_FLIGHT::QAR2(B),XP(a)
  • Tries
    • Try
      • S(A);XP(a)
      • Vars
        • K(b);P-FLIGHT::QAR(B)+S(A)
        • K(b);S_FLIGHT::QAR(B)+S(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(A);
      • Vars
        • K(b);P_SPINP(a),S_FLIGHT::QAR2(B),XP(a)
      • Refutation
        • K(b);S_FLIGHT,XS(A)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(b);P-FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • P(a);XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • K(b);P-FLIGHT::QAB1(B)
        • K(b);S_FLIGHT::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • P(C);
      • Vars
        • K(b);P-FLIGHT,P_SPINP(a)::QAR1(B),XP(a)
        • K(b);P_SPINP(a),S_FLIGHT::QAR2(B),XP(a)
      • Refutation
        • P(c);XP(C)
  • Actual
    • Q(B);CHECK,XP(a)
    • Vars
      • K(b);P-FLIGHT::QAR1(B)
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