MESON Chess Problem Database

Problem Display
PID: 190298 (bB6/b1r5/3r2B1/2R2pp1/5k2/1Q1R4/3N3P/1K4n1 w - - 0 1)

Umnov, Evgeny Ivanovich

2nd Prize, 64 Shakhmatnoe obozrenie, 1931

bB6/b1r5/3r2B1/2R2pp1/5k2/1Q1R4/3N3P/1K4n1

#2

8 + 8

14752 Soviet Chess Compositions (1945-1947) 1947

SOLUTION

  • SOUND
  • Sets
    • 1...Rdc6
      • 2.Rd4#
      • 2.Qa4#
      • 2.Qc4#
      • 2.Qb4#
    • 1...Rcc6
      • 2.Rd4#
      • 2.Qa4#
      • 2.Qc4#
      • 2.Qb4#
    • 1...Rb7
      • 2.Rd4#
    • 1...g4
      • 2.Rxf5#
  • Tries
    • 1.Rd4+?
      • 1...Rxd4
        • 2.Qg3#
      • 1...Be4+!
  • Keys
    • 1.Rdd5!
      • threat
        • 2.Qg3#
      • 1...Kg4
        • 2.Qg3#
      • 1...Rb6
        • 2.Rc4#
      • 1...Rb7
        • 2.Rd4#
      • 1...Se2
        • 2.Qf3#
      • 1...Sf3
        • 2.Qxf3#
      • 1...g4
        • 2.Rxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(g);P_PINQ(D),P_SPINR(e),S_CUTB(h)::R(E)
    • P(d);SBLOCK::R1(F),XP(c)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • R(e);P_SPINR(g),XR(E)::QAB1(D)
      • Refutation
        • B(h);CHECK,P_SPINB(h)
  • Actual
    • R(E);
    • Threat
      • QAB1(D)
    • Vars
      • K(b);P-FLIGHT::QAR1(D)
      • R(e);P_PINQ(D),P_SPINR(g),S_CUTB(f)::R(F)
      • R(g);P_PINQ(D),P_SPINR(e),S_CUTB(h)::R(E)
      • S(a);N_GUARD::QAR1(D)
      • S(a);N_GUARD::QAR1(D),XS(a)
      • P(d);SBLOCK::R1(E),XP(c)
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