MESON Chess Problem Database

Problem Display
PID: 179682 (1Q2R3/8/8/8/2Np2K1/2nkN2B/R7/4b3 w - - 0 1)

Kopnin, Aleksey Grigorevich

Shakhmaty v SSSR, 1947

1Q2R3/8/8/8/2Np2K1/2nkN2B/R7/4b3

#2

7 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bd2
      • 2.Rxd2#
    • 1...Bf2
      • 2.Rd2#
    • 1...Bg3
      • 2.Rd2#
    • 1...Bh4
      • 2.Rd2#
  • Tries
    • 1.Rc2?
      • threat
        • 2.Sb2#
      • 1...Bd2
        • 2.Rxd2#
      • 1...Sd1
        • 2.Bf1#
      • 1...Sa4
        • 2.Bf1#
      • 1...Se4
        • 2.Bf1#
      • 1...dxe3!
    • 1.Qb2?
      • threat
        • 2.Qc2#
      • 1...Bd2
        • 2.Qxd2#
      • 1...dxe3!
    • 1.Qb3?
      • threat
        • 2.Bf1#
        • 2.Qc2#
      • 1...Bd2
        • 2.Bf1#
        • 2.Rxd2#
      • 1...dxe3!
  • Keys
    • 1.Qb4!
      • 1...Sxa2
        • 2.Bf1#
      • 1...dxe3
        • 2.Se5#
      • 1...Bd2
        • 2.Rxd2#
      • 1...Bf2
        • 2.Rd2#
      • 1...Bg3
        • 2.Rd2#
      • 1...Bh4
        • 2.Rd2#
      • 1...Sb1
        • 2.Bf1#
      • 1...Sd1
        • 2.Bf1#
      • 1...Se2
        • 2.Sb2#
      • 1...Sa4
        • 2.Bf1#
      • 1...Se4
        • 2.Bf1#
      • 1...Sb5
        • 2.Bf1#
      • 1...Sd5
        • 2.Bf1#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • B(a);N_GUARD::R1(A),XB(a)
    • B(a);N_GUARD::R1(A)
  • Tries
    • Try
      • R(A);
      • Threat
        • S(D)
      • Vars
        • B(a);N_GUARD::R1(A),XB(a)
        • S(b);N_GUARD::B(C)
      • Refutation
        • P(d);XS(B)
    • Try
      • Q(F);
      • Threat
        • QAB1(F)
      • Vars
        • B(a);N_GUARD::QAR1(F),XB(a)
      • Refutation
        • P(d);XS(B)
    • Try
      • Q(F);P_PINS(b)
      • Threat
        • DUALS(2)
      • Refutation
        • P(d);XS(B)
  • Actual
    • Q(F);
    • Vars
      • S(b);N_GUARD,XR(A)::B(C)
      • P(d);SBLOCK,XS(B)::S(D)
      • B(a);N_GUARD::R1(A),XB(a)
      • B(a);N_GUARD::R1(A)
      • S(b);N_GUARD::B(C)
      • S(b);SBLOCK::S(D)
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