MESON Chess Problem Database

Problem Display
PID: 157598 (8/8/8/8/Q4Knk/5Bp1/8/4R3 w - - 0 1)

Kozhakin, Vladimir Vladimirovich

Sahovska Kompozicia, 1982

8/8/8/8/Q4Knk/5Bp1/8/4R3

#2

4 + 3

15148 Sadier Collection 2016
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Se3
      • 2.Rh1#
    • 1...Se5
      • 2.Rh1#
    • 1...Sf6
      • 2.Rh1#
    • 1...Sh6
      • 2.Rh1#
  • Tries
    • 1.Kf5?
      • threat
        • 2.Rh1#
        • 2.Qxg4#
      • 1...Kh5
        • 2.Rh1#
      • 1...g2
        • 2.Qxg4#
      • 1...Kh3!
    • 1.Qb5?
      • 1...Kh3
        • 2.Qh5#
      • 1...Sf2
        • 2.Qh5#
      • 1...Sh2
        • 2.Qh5#
      • 1...Se3
        • 2.Rh1#
        • 2.Qh5#
      • 1...Se5
        • 2.Rh1#
      • 1...Sf6
        • 2.Rh1#
      • 1...Sh6
        • 2.Rh1#
        • 2.Qh5#
      • 1...g2!
    • 1.Qe8?
      • 1...Kh3
        • 2.Qh5#
      • 1...Sf2
        • 2.Qh5#
        • 2.Qh8#
      • 1...Sh2
        • 2.Qh5#
        • 2.Qh8#
      • 1...Se3
        • 2.Rh1#
        • 2.Qh5#
        • 2.Qh8#
      • 1...Se5
        • 2.Rh1#
        • 2.Qh5#
        • 2.Qh8#
      • 1...Sf6
        • 2.Rh1#
      • 1...Sh6
        • 2.Rh1#
        • 2.Qh5#
      • 1...g2!
    • 1.Qa5?
      • 1...Kh3
        • 2.Qh5#
      • 1...Sf2
        • 2.Qh5#
      • 1...Sh2
        • 2.Qh5#
      • 1...Se3
        • 2.Rh1#
        • 2.Qh5#
      • 1...Se5
        • 2.Rh1#
      • 1...Sf6
        • 2.Rh1#
      • 1...Sh6
        • 2.Rh1#
        • 2.Qh5#
      • 1...g2!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qxg4#
      • 1...Kh3
        • 2.Rh1#
      • 1...Kh5
        • 2.Qh7#
      • 1...Sf2
        • 2.Qh7#
      • 1...Sh2
        • 2.Qh7#
      • 1...Se3
        • 2.Rh1#
        • 2.Qh7#
      • 1...Se5
        • 2.Rh1#
        • 2.Qh7#
      • 1...Sf6
        • 2.Rh1#
      • 1...Sh6
        • 2.Rh1#

This anticipates 246078(1990)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • S(b);N_GUARD::R(A)
  • Tries
    • Try
      • K(D);P-FLIGHT,P_PINS(b)
      • Threat
        • DUALS(2)
      • Vars
        • K(c);P-FLIGHT::R(A)
        • P(a);::QAR1(C),XS(b)
      • Refutation
        • K(c);N_SPINS(b),P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • K(c);P-FLIGHT::QAR2(C)
        • S(b);::QAR1(C)
        • S(b);N_GUARD::R(A)
      • Refutation
        • P(a);
    • Try
      • Q(C);
      • Vars
        • K(c);P-FLIGHT::QAR2(C)
        • S(b);N_GUARD::R(A)
      • Refutation
        • P(a);
    • Try
      • Q(C);
      • Vars
        • K(c);P-FLIGHT::QAR2(C)
        • S(b);::QAR1(C)
        • S(b);N_GUARD::R(A)
      • Refutation
        • P(a);
  • Actual
    • Q(C);
    • Threat
      • QAR1(C),XS(b)
    • Vars
      • K(c);P-FLIGHT,P_SPINS(b)::R(A)
      • K(c);P-FLIGHT,P_SPINS(b)::QAR2(C)
      • S(b);N_GUARD::QAR(C)
      • S(b);N_GUARD::R(A)
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