MESON Chess Problem Database

Problem Display
PID: 202328 (8/8/3ppB2/1Q2b2P/3Pkp2/R5p1/1P4N1/3K4 w - - 0 1)

Margulis, Isaak L

3/4 Prize, Soroca Ty., 1923

8/8/3ppB2/1Q2b2P/3Pkp2/R5p1/1P4N1/3K4

#2

8 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd4
      • 2.Ra4#
    • 1...d5
      • 2.Qd3#
  • Tries
    • 1.dxe5?
      • threat
        • 2.Qd3#
      • 1...Kd4
        • 2.Ra4#
      • 1...Kf5!
  • Keys
    • 1.Rf3!
      • 1...Kxf3
        • 2.Qe2#
      • 1...Kxd4
        • 2.Rxf4#
      • 1...Kf5
        • 2.Rxf4#
      • 1...Bxd4
        • 2.Rxf4#
      • 1...Bxf6
        • 2.Rxf4#
      • 1...d5
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(b);OGATEB,P-FLIGHT,P_SPINB(d),XP(E)::R(D)
    • P(e);SBLOCK::QAB1(F)
  • Tries
    • Try
      • P(E);XB(d)
      • Threat
        • QAB1(F)
      • Vars
        • K(b);P-FLIGHT::R(D)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • R(D);
    • Vars
      • K(b);S_FLIGHT,XR(D)::QAB1(F)
      • K(b);P-FLIGHT,P_SPINB(d),XP(E)::R(D),XP(c)
      • K(b);P_SPINB(d),P_SPINP(c),S_FLIGHT::R1(D),XP(c)
      • B(d);N_GUARD,XP(E)::R1(D),XP(c)
      • B(d);N_GUARD,XB(H)::R1(D),XP(c)
      • P(e);SBLOCK::QAB1(F)
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