MESON Chess Problem Database

Problem Display
PID: 147222 (B1r3q1/4p2p/8/2RNp3/k1K1Q1p1/1RBN4/Pp2b2r/8 w - - 0 1)

Dolginovich, Nikolai Osipovich

Canadian Chess Chat, 1983

B1r3q1/4p2p/8/2RNp3/k1K1Q1p1/1RBN4/Pp2b2r/8

#2

9 + 10

5454 Near Snap 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd5+
      • 2.Kxd5#
    • 1...Qg5
      • 2.Sb6#
    • 1...Qg7
      • 2.Sb6#
    • 1...Qe8
      • 2.Sb6#
    • 1...Qf8
      • 2.Sb6#
    • 1...Qh8
      • 2.Sb6#
    • 1...Rxc5+
      • 2.Kxc5#
    • 1...Rc6
      • 2.Bxc6#
    • 1...Rb8
      • 2.Ra5#
    • 1...Rd8
      • 2.Bc6#
      • 2.Ra5#
    • 1...Re8
      • 2.Bc6#
      • 2.Ra5#
    • 1...Rf8
      • 2.Bc6#
      • 2.Ra5#
    • 1...Bxd3+
      • 2.Kxd3#
    • 1...e6
      • 2.Sb6#
  • Tries
    • 1.Bxb2?
      • threat
        • 2.Kc3#
        • 2.Ra3#
        • 2.Rb4#
      • 1...Qxd5+
        • 2.Kxd5#
      • 1...Bxd3+
        • 2.Kxd3#
      • 1...Qg6
        • 2.Sc3#
        • 2.Ra3#
        • 2.Rb4#
      • 1...Rb8
        • 2.Ra3#
      • 1...Bf3
        • 2.Ra3#
        • 2.Rb4#
      • 1...Rxc5+!
    • 1.Bd2?
      • threat
        • 2.Kc3#
      • 1...Qxd5+
        • 2.Kxd5#
      • 1...Rxc5+
        • 2.Kxc5#
      • 1...Bxd3+
        • 2.Kxd3#
      • 1...Qg6
        • 2.Sc3#
      • 1...Rb8
        • 2.Ra5#
      • 1...Bf3
        • 2.Sxb2#
      • 1...b1S!
  • Keys
    • 1.Rc6!
      • threat
        • 2.Kc5#
      • 1...Qxd5+
        • 2.Kxd5#
      • 1...Rxc6+
        • 2.Bxc6#
      • 1...Bxd3+
        • 2.Kxd3#
      • 1...Qg6
        • 2.Sb6#
      • 1...Rb8
        • 2.Ra6#
      • 1...Bf3
        • 2.Sc5#

Anticipated by 62937(1982), 15322(1982-1983)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • Q(j);CHECK,XS(H)::QAR(F)+K(E),XQ(j)
    • Q(j);::S(H)
    • R(i);CHECK,XR(G)::QAR(F)+K(E),XR(i)
    • R(i);N_GUARD::B(I),XR(i)
    • R(i);N_PINR(G)::R1(G)
    • B(b);CHECK,P_PINS(H),XS(D)::QAR(F)+K(E),XB(b)
    • P(g);::S(H)
  • Tries
    • Try
      • B(C);XP(a)
      • Threat
        • DUALS(3)
      • Vars
        • Q(j);CHECK,XS(H)::QAR(F)+K(E),XQ(j)
        • B(b);CHECK,P_PINS(H),XS(D)::QAR(F)+K(E),XB(b)
        • R(i);N_PINR(G)::R1(B)
      • Refutation
        • R(i);CHECK,XR(G)
    • Try
      • B(C);
      • Threat
        • QAR(F)+K(E)
      • Vars
        • Q(j);CHECK,XS(H)::QAR(F)+K(E),XQ(j)
        • R(i);CHECK,XR(G)::QAR(F)+K(E),XR(i)
        • B(b);CHECK,P_PINS(H),XS(D)::QAR(F)+K(E),XB(b)
        • Q(j);::S(H)
        • R(i);N_PINR(G)::R1(G)
        • B(b);N_PINS(D),P_PINS(H)::S(D),XP(a)
      • Refutation
        • P(a);
  • Actual
    • R(G);
    • Threat
      • QAR(F)+K(E)
    • Vars
      • Q(j);CHECK,XS(H)::QAR(F)+K(E),XQ(j)
      • R(i);CHECK,OGATE,XR(G)::B(I),XR(i)
      • B(b);CHECK,P_PINS(H),XS(D)::QAR(F)+K(E),XB(b)
      • Q(j);::S(H)
      • R(i);N_PINR(G)::R(G)
      • B(b);N_PINS(D),P_PINS(H)::S(D)
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