MESON Chess Problem Database

Problem Display
PID: 197456 (B7/8/8/6K1/4NQ1p/8/6k1/7r w - - 0 1)

Kokkonen, Matti

Suomen Shakki, 1986

B7/8/8/6K1/4NQ1p/8/6k1/7r

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kg1
      • 2.Qf2#
    • 1...Kh3
      • 2.Sf2#
    • 1...h3
      • 2.Qf2#
  • Tries
    • 1.Sd2+?
      • 1...Kh3
        • 2.Qxh4#
      • 1...Kg1!
    • 1.Sg3+?
      • 1...Kg1
        • 2.Se2#
      • 1...Kh3
        • 2.Qxh4#
      • 1...Kh2!
    • 1.Sc5+?
      • 1...Kh3
        • 2.Qxh4#
      • 1...Kg1!
    • 1.Sd6+?
      • 1...Kh3
        • 2.Qxh4#
      • 1...Kg1!
    • 1.Sf6+?
      • 1...Kh3
        • 2.Qxh4#
      • 1...Kg1!
    • 1.Qd2+?
      • 1...Kf1
        • 2.Qf2#
      • 1...Kg1
        • 2.Qf2#
      • 1...Kf3
        • 2.Qf2#
      • 1...Kh3!
    • 1.Qg3+?
      • 1...Kf1
        • 2.Qf2#
      • 1...hxg3!
  • Keys
    • 1.Sc3+!
      • 1...Kg1
        • 2.Se2#
      • 1...Kh3
        • 2.Qxh4#

FEATURES

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