MESON Chess Problem Database

Problem Display
PID: 249854 (8/1b1n3Q/7N/2pp2R1/2PkBB2/8/K7/2R5 w - - 0 1)

Nadezhdin, Nikolai Dmitrievich

Schach, 1979

8/1b1n3Q/7N/2pp2R1/2PkBB2/8/K7/2R5

#2

8 + 5

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ba6
      • 2.Rxd5#
    • 1...Bc8
      • 2.Rxd5#
  • Tries
    • 1.Kb3?
      • threat
        • 2.Rd1#
      • 1...dxc4+
        • 2.Rxc4#
      • 1...Se5!
    • 1.Bb1?
      • threat
        • 2.Sf5#
        • 2.Qd3#
      • 1...Se5
        • 2.Sf5#
      • 1...dxc4!
    • 1.Bxd5?
      • threat
        • 2.Qe4#
      • 1...Bxd5
        • 2.Rxd5#
      • 1...Sf6!
    • 1.Qe7?
      • threat
        • 2.Sf5#
      • 1...Se5
        • 2.Qxe5#
      • 1...dxe4!
  • Keys
    • 1.Rg3!
      • threat
        • 2.Rd3#
      • 1...dxc4
        • 2.Rd1#
      • 1...dxe4
        • 2.Sf5#
      • 1...Se5
        • 2.Be3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(d);N_GUARD::R1(F),XP(c)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • R(A)
      • Vars
        • P(c);CHECK,OGATE,XP(C)::R1(A),XP(c)
      • Refutation
        • S(e);
    • Try
      • B(D);
      • Threat
        • DUALS(2)
      • Vars
        • S(e);::S(G)
      • Refutation
        • P(c);XP(C)
    • Try
      • B(D);XP(c)
      • Threat
        • QAR1(H)
      • Vars
        • B(d);OGATE,P_PINP(C),XB(D)::R1(F),XB(d)
      • Refutation
        • S(e);
    • Try
      • Q(H);
      • Threat
        • S(G)
      • Vars
        • S(e);N_GUARD::QAB1(H),XS(e)
      • Refutation
        • P(c);XB(D)
  • Actual
    • R(F);
    • Threat
      • R1(F)
    • Vars
      • P(c);SBLOCK,XP(C)::R(A)
      • P(c);SBLOCK,XB(D)::S(G)
      • S(e);SBLOCK::B(E)
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