MESON Chess Problem Database

Problem Display
PID: 198435 (8/8/3p1N2/4k3/3N4/8/3K4/2Q3R1 w - - 0 1)

Kalgin, Mikhail

Sachova skladba, 1997

8/8/3p1N2/4k3/3N4/8/3K4/2Q3R1

#2

5 + 2

5454 Near Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd4
      • 2.Qc3#
  • Tries
    • 1.Rf1?
      • 1...Kxd4
        • 2.Qc3#
      • 1...d5!
    • 1.Rg5+?
      • 1...Kxd4
        • 2.Rd5#
        • 2.Qc3#
      • 1...Kf4
        • 2.Kd1#
        • 2.Ke1#
        • 2.Kc2#
        • 2.Ke2#
        • 2.Kc3#
        • 2.Kd3#
      • 1...Kxf6!
    • 1.Qe1+?
      • 1...Kf4
        • 2.Sd5#
        • 2.Sh5#
        • 2.Rg4#
        • 2.Qg3#
        • 2.Qe3#
        • 2.Qe4#
      • 1...Kxf6
        • 2.Qe6#
      • 1...Kxd4!
    • 1.Qc8?
      • 1...Kxd4
        • 2.Qc3#
      • 1...Kf4
        • 2.Qf5#
      • 1...Kxf6
        • 2.Qe6#
      • 1...d5!
  • Keys
    • 1.Qc7!
      • 1...Kxd4
        • 2.Qc3#
      • 1...Kf4
        • 2.Qxd6#
      • 1...Kxf6
        • 2.Qg7#

Anticipated by 80435(1962), 77644(1988), 209096(1988)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);OGATEB,S_FLIGHT,XS(D)::QAB1(A)
  • Tries
    • Try
      • R(B);
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(D)::QAB1(A)
      • Refutation
        • P(b);
    • Try
      • R(B);CHECK
      • Refutation
        • K(a);S_FLIGHT,XS(E)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT,XS(E)::QAR1(A)
      • Refutation
        • K(a);S_FLIGHT,XS(D)
    • Try
      • Q(A);
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(D)::QAB1(A)
        • K(a);S_FLIGHT::QAR1(A)
        • K(a);S_FLIGHT,XS(E)::QAR1(A)
      • Refutation
        • P(b);
  • Actual
    • Q(A);P_PINP(b)
    • Vars
      • K(a);N_SPINP(b),OGATEB,S_FLIGHT,XS(D)::QAB1(A)
      • K(a);S_FLIGHT::QAB(A),XP(b)
      • K(a);N_SPINP(b),OGATEB,S_FLIGHT,XS(E)::QAB1(A)
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