MESON Chess Problem Database

Problem Display
PID: 247339 (8/8/8/3N4/8/5Pkp/1Q6/5K1n w - - 0 1)

Parkhomenko, Nikolai A

Uralski Problemist, 2006

8/8/8/3N4/8/5Pkp/1Q6/5K1n

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Qxf2#
  • Tries
    • 1.Qe5+?
      • 1...Kxf3
        • 2.Qf4#
      • 1...Kh4!
    • 1.Qg7+?
      • 1...Kh2
        • 2.Qg1#
      • 1...Kh4
        • 2.Qg4#
      • 1...Kxf3!
    • 1.Qg2+?
      • 1...Kh4
        • 2.Qg4#
      • 1...hxg2+!
    • 1.Qb4?
      • threat
        • 2.Qf4#
      • 1...Kxf3
        • 2.Qf4#
      • 1...h2
        • 2.Qg4#
      • 1...Kh2!
    • 1.Qb8+?
      • 1...Kxf3
        • 2.Qf4#
      • 1...Kh4!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Qf4#
      • 1...Kh2
        • 2.Qg1#
      • 1...Kxf3
        • 2.Qf4#
      • 1...h2
        • 2.Qg4#

FEATURES

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