MESON Chess Problem Database

Problem Display
PID: 187603 (2nR4/Q3b3/8/1Pppk3/8/2P2K1B/8/8 w - - 0 1)

Ulyanov, Dmitri Ilich

Niva, 1909

2nR4/Q3b3/8/1Pppk3/8/2P2K1B/8/8

#2

6 + 5

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bd6
      • 2.Qg7#
    • 1...Sb6
      • 2.Qxe7#
    • 1...Sd6
      • 2.Qxe7#
    • 1...c4
      • 2.Qd4#
  • Tries
    • 1.Qc7+?
      • 1...Bd6
        • 2.Qg7#
      • 1...Sd6
        • 2.Qxe7#
      • 1...Kf6!
    • 1.Qd7?
      • threat
        • 2.Qf5#
        • 2.Qe6#
      • 1...Bxd8
        • 2.Qe6#
      • 1...Sd6
        • 2.Qe6#
        • 2.Qxe7#
      • 1...Kf6!
  • Keys
    • 1.Rd6!
      • threat
        • 2.Re6#
      • 1...Kxd6
        • 2.Qb8#
      • 1...Bxd6
        • 2.Qg7#
      • 1...Sxd6
        • 2.Qxe7#
      • 1...d4
        • 2.Qxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(d);OGATE::QAB(E)
    • S(e);N_GUARD::QAR2(E),XB(d)
    • P(a);OGATE::QAB1(E)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • B(d);OGATE,P_SPINB(d)::QAB(E)
        • S(e);N_GUARD,P_SPINS(e)::QAR2(E),XB(d)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • B(d);XR(F)::QAR1(E)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • R(F);
    • Threat
      • R1(F)
    • Vars
      • K(c);OGATEB,S_FLIGHT,XR(F)::QAB(E)
      • B(d);OGATE,SBLOCK,XR(F)::QAB(E)
      • S(e);N_GUARD,XR(F)::QAR2(E),XB(d)
      • P(b);OGATEB::QAR2(E),XP(a)
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