MESON Chess Problem Database

Problem Display
PID: 179709 (3q2b1/8/pnB5/R4NN1/1pk5/1ppR2QK/1n1bp3/8 w - - 0 1)

Kopnin, Aleksey Grigorevich

Source?, 1988

3q2b1/8/pnB5/R4NN1/1pk5/1ppR2QK/1n1bp3/8

#2

7 + 11

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg5
      • 2.Sd6#
      • 2.Rd4#
    • 1...Qc7
      • 2.Rd4#
    • 1...Qe7
      • 2.Rd4#
    • 1...Qd4
      • 2.Rxd4#
    • 1...Qd6
      • 2.Sxd6#
    • 1...Qa8
      • 2.Sd6#
      • 2.Rd4#
    • 1...Qb8
      • 2.Rd4#
    • 1...Qc8
      • 2.Rd4#
    • 1...Qe8
      • 2.Sd6#
      • 2.Rd4#
    • 1...Qf8
      • 2.Rd4#
    • 1...Bd5
      • 2.Rd4#
    • 1...Sd5
      • 2.Rd4#
    • 1...Sd7
      • 2.Sd6#
      • 2.Rd4#
  • Tries
    • 1.Bb5+?
      • 1...Kc5
        • 2.Se4#
      • 1...axb5!
    • 1.Bd5+?
      • 1...Bxd5
        • 2.Rd4#
      • 1...Sxd5
        • 2.Rd4#
      • 1...Qxd5!
    • 1.Qf4+?
      • 1...Kxd3
        • 2.Qe4#
      • 1...Qd4
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Bxf4!
    • 1.Qh4+?
      • 1...Kxd3
        • 2.Qe4#
      • 1...Qd4
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Bf4!
    • 1.Qg4+?
      • 1...Kxd3
        • 2.Qe4#
      • 1...Qd4
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Bf4!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Bb5#
      • 1...Qxd3+
        • 2.Bf3#
      • 1...Kxd3
        • 2.Be4#
      • 1...Qxc7
        • 2.Rd4#
      • 1...Sxd3
        • 2.Bd5#
      • 1...Qd4
        • 2.Rxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • Q(j);N_GUARD::R1(A)
    • Q(j);N_GUARD::R1(A),XQ(j)
    • Q(j);N_GUARD::S(E),XQ(j)
    • Q(j);N_GUARD,P_PINS(E)::R1(A)
    • B(k);S_CUTQ(j)::R1(A)
    • S(i);S_CUTQ(j)::R1(A)
  • Tries
    • Try
      • B(G);CHECK
      • Vars
        • K(g);P-FLIGHT::S(F)
      • Refutation
        • P(h);XB(G)
    • Try
      • B(G);CHECK
      • Vars
        • B(k);XB(G)::R1(A)
        • S(i);XB(G)::R1(A)
      • Refutation
        • Q(j);XB(G)
    • Try
      • Q(B);CHECK
      • Vars
        • K(g);S_FLIGHT,XR(A)::QAB1(B)
      • Refutation
        • B(b);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(g);S_FLIGHT,XR(A)::QAB1(B)
      • Refutation
        • B(b);P_SPINB(b)
    • Try
      • Q(B);CHECK
      • Vars
        • K(g);S_FLIGHT,XR(A)::QAB1(B)
      • Refutation
        • B(b);P_SPINB(b)
  • Actual
    • Q(B);
    • Threat
      • QAR(B)+B(G),DCHECK
    • Vars
      • Q(j);CHECK,N_GUARD,SBLOCK,XR(A)::QAR(B)+B(G)
      • K(g);S_FLIGHT,XR(A)::B(G)
      • Q(j);N_GUARD,XQ(B)::R1(A)
      • S(a);SBLOCK,XR(A)::QAR(B)+B(G),DCHECK
      • Q(j);N_GUARD::R1(A),XQ(j)
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