MESON Chess Problem Database

Problem Display
PID: 280243 (4R3/1Q6/3Pp2B/p2pk3/K7/8/3P4/1B6 w - - 0 1)

Koshel, Mikhail Igorevich

Shakhmatnaya kompozitsiya, 2024

4R3/1Q6/3Pp2B/p2pk3/K7/8/3P4/1B6

#2

7 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6
      • 2.Qg7#
  • Tries
    • 1.Rxe6+?
      • 1...Kxe6
        • 2.Qe7#
      • 1...Kd4!
    • 1.Rc8?
      • 1...Kd4
        • 2.Qb2#
      • 1...Kxd6
        • 2.Qc7#
      • 1...Kf6
        • 2.Qg7#
      • 1...d4!
    • 1.Qxd5+?
      • 1...Kf6
        • 2.Rf8#
        • 2.Qxe6#
      • 1...Kxd5!
    • 1.Qc7?
      • 1...Kd4
        • 2.Qc3#
      • 1...Kf6
        • 2.Qg7#
      • 1...d4!
    • 1.Qd7?
      • 1...Kf6
        • 2.Rxe6#
        • 2.Qxe6#
        • 2.Qg7#
      • 1...d4
        • 2.Qxe6#
      • 1...Kd4!
    • 1.Qe7?
      • 1...d4
        • 2.Qxe6#
      • 1...Kd4!
    • 1.d4+?
      • 1...Kxd6
        • 2.Bf8#
        • 2.Rd8#
      • 1...Kf6
        • 2.Rf8#
        • 2.Qe7#
        • 2.Qg7#
      • 1...Kxd4!
  • Keys
    • 1.Qc8!
      • 1...Kd4
        • 2.Qc3#
      • 1...Kxd6
        • 2.Rxe6#
      • 1...Kf6
        • 2.Qxe6#
      • 1...d4
        • 2.Qxe6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(c);N_GUARD,N_SPINP(d),S_FLIGHT::QAB1(F)
  • Tries
    • Try
      • R(G);CHECK,XP(d)
      • Vars
        • K(c);N_GUARD,P-FLIGHT,XR(G)::QAR1(F)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(G);N_PINP(d)
      • Vars
        • K(c);N_GUARD,S_CUTP(b),S_FLIGHT::QAB(F)
        • K(c);OGATEB,S_FLIGHT,XP(D)::QAB1(F)
        • K(c);N_GUARD,S_FLIGHT::QAB1(F)
      • Refutation
        • P(b);
    • Try
      • Q(F);CHECK,XP(b)
      • Refutation
        • K(c);N_SPINP(d),P-FLIGHT,XQ(F)
    • Try
      • Q(F);
      • Vars
        • K(c);N_GUARD,N_SPINP(d),S_CUTP(b),S_FLIGHT::QAB1(F)
        • K(c);N_GUARD,N_SPINP(d),S_FLIGHT::QAB1(F)
      • Refutation
        • P(b);
    • Try
      • Q(F);
      • Vars
        • P(b);SBLOCK::QAR1(F),XP(d)
      • Refutation
        • K(c);N_SPINP(d),S_FLIGHT
    • Try
      • Q(F);
      • Vars
        • P(b);SBLOCK::QAR1(F),XP(d)
      • Refutation
        • K(c);N_SPINP(d),S_FLIGHT
    • Try
      • P(B);CHECK
      • Refutation
        • K(c);N_SPINP(d),S_FLIGHT,XP(B)
  • Actual
    • Q(F);
    • Vars
      • K(c);N_GUARD,N_SPINP(d),S_CUTP(b),S_FLIGHT::QAB1(F)
      • K(c);N_GUARD,N_SPINP(d),S_FLIGHT,XP(D)::R1(G),XP(d)
      • K(c);N_GUARD,N_SPINP(d),S_FLIGHT::QAR1(F),XP(d)
      • P(b);SBLOCK::QAR1(F),XP(d)
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