MESON Chess Problem Database

Problem Display
PID: 70874 (8/1K4n1/1B3QN1/6p1/4k3/7r/3R4/8 w - - 0 1)

Popov, Grigory Leontievich

1st Prize, Il Due Mosse, 1959

8/1K4n1/1B3QN1/6p1/4k3/7r/3R4/8

#2

5 + 4

5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Re3
      • 2.Rd4#
    • 1...Rf3
      • 2.Qe5#
    • 1...Sf5
      • 2.Qc6#
    • 1...g4
      • 2.Qf4#
  • Tries
    • 1.Qxg5?
      • threat
        • 2.Qf4#
        • 2.Qg4#
        • 2.Qd5#
      • 1...Kf3
        • 2.Qf4#
        • 2.Qg2#
      • 1...Rf3
        • 2.Rd4#
        • 2.Qd5#
        • 2.Qe5#
      • 1...Rg3
        • 2.Qf4#
        • 2.Qd5#
      • 1...Rh4
        • 2.Qd5#
      • 1...Rh5
        • 2.Qf4#
        • 2.Qg4#
      • 1...Sf5
        • 2.Qf4#
        • 2.Qg4#
      • 1...Sh5
        • 2.Qd5#
      • 1...Se6
        • 2.Qd5#
      • 1...Rd3!
  • Keys
    • 1.Rf2!
      • threat
        • 2.Qd4#
      • 1...Kd3
        • 2.Qd4#
      • 1...Kd5
        • 2.Qc6#
      • 1...Rd3
        • 2.Qe5#
      • 1...Rf3
        • 2.Qxf3#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Se6
        • 2.Qf5#

This anticipates 133175(1984)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • R(a);SBLOCK::R1(A)
    • R(a);SBLOCK::QAR1(C)
    • S(d);SBLOCK::QAB(C)
    • P(c);N_GUARD::QAR1(C)
  • Tries
    • Try
      • Q(C);XP(c)
      • Threat
        • DUALS(3)
      • Vars
        • R(a);::QAB1(C)
        • S(d);::QAB1(C)
      • Refutation
        • R(a);
  • Actual
    • R(A);
    • Threat
      • QAR1(C)
    • Vars
      • K(b);S_FLIGHT::QAR1(C)
      • K(b);S_FLIGHT::QAB1(C)
      • R(a);SBLOCK::QAR1(C)
      • R(a);N_GUARD::QAB1(C),XR(a)
      • S(d);N_GUARD::QAB1(C),XS(d)
      • S(d);N_GUARD::QAB1(C)
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