MESON Chess Problem Database

Problem Display
PID: 228837 (8/8/8/2K1p1B1/4k3/1Q1R3r/8/8 w - - 0 1)

Kalina, Vasily Emanuilovich

Sahovski Glasnik, 1926

8/8/8/2K1p1B1/4k3/1Q1R3r/8/8

#2

4 + 3

6490 yacpdb 2020
3713 Snap 2026

SOLUTION

  • SOUND
  • Tries
    • 1.Rf3?
      • threat
        • 2.Qd5#
        • 2.Qd3#
        • 2.Qe3#
        • 2.Qb7#
      • 1...Rh6
        • 2.Qd5#
        • 2.Qd3#
        • 2.Qe3#
      • 1...Rh7
        • 2.Qd5#
        • 2.Qd3#
        • 2.Qe3#
      • 1...Rxf3!
    • 1.Qa4+?
      • 1...Kxd3
        • 2.Qc4#
      • 1...Kf5!
    • 1.Qf7?
      • threat
        • 2.Qg6#
      • 1...Kxd3
        • 2.Qc4#
      • 1...Re3
        • 2.Rxe3#
      • 1...Rf3
        • 2.Qxf3#
      • 1...Rh6
        • 2.Re3#
        • 2.Qf3#
      • 1...Rxd3!
    • 1.Qb4+?
      • 1...Kxd3
        • 2.Qc4#
      • 1...Kf5!
  • Keys
    • 1.Qe6!
      • threat
        • 2.Qg6#
      • 1...Kxd3
        • 2.Qc4#
      • 1...Rxd3
        • 2.Qg4#
      • 1...Re3
        • 2.Rxe3#
      • 1...Rf3
        • 2.Rd4#
      • 1...Rh6
        • 2.Re3#

This anticipates 287350(2005)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(B);
      • Threat
        • DUALS(4)
      • Refutation
        • R(a);XR(B)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT,XR(B)::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • K(b);S_FLIGHT,XR(B)::QAB1(A)
        • R(a);N_GUARD::R1(B),XR(a)
        • R(a);N_GUARD::QAB1(A),XR(a)
      • Refutation
        • R(a);XR(B)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT,XR(B)::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(A);P_PINP(c)
    • Threat
      • QAB(A)
    • Vars
      • K(b);N_SPINP(c),S_FLIGHT,XR(B)::QAB1(A)
      • R(a);SBLOCK,XR(B)::QAR2(A)
      • R(a);N_GUARD::R1(B),XR(a)
      • R(a);SBLOCK::R1(B)
      • R(a);N_GUARD::R1(B)
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