MESON Chess Problem Database

Problem Display
PID: 180333 (8/8/8/4B1R1/1pK1kb2/4pN2/4N1Pn/6nQ w - - 0 1)

Lider, Valentin Viktorovich

Shakhmaty v SSSR, 1963

8/8/8/4B1R1/1pK1kb2/4pN2/4N1Pn/6nQ

#2

7 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bg3
      • 2.Sxg3#
    • 1...Bxe5
      • 2.Rxe5#
    • 1...Bxg5
      • 2.Sg3#
    • 1...Sxe2
      • 2.Qb1#
    • 1...Sgxf3
      • 2.Qb1#
    • 1...Sh3
      • 2.Qb1#
    • 1...Sf1
      • 2.Qh7#
    • 1...Shxf3
      • 2.Qh7#
    • 1...Sg4
      • 2.Qh7#
    • 1...b3
      • 2.Sc3#
  • Tries
    • 1.Bxf4?
      • threat
        • 2.Re5#
      • 1...Sgxf3
        • 2.Qb1#
      • 1...Shxf3
        • 2.Qh7#
      • 1...Sg4
        • 2.Qh7#
      • 1...Sxe2!
    • 1.Bd6?
      • 1...Bxg5
        • 2.Sg3#
      • 1...Sxe2
        • 2.Qb1#
      • 1...Sgxf3
        • 2.Qb1#
      • 1...Shxf3
        • 2.Qh7#
      • 1...Bg3
        • 2.Sxg3#
      • 1...Be5
        • 2.Rxe5#
      • 1...Sh3
        • 2.Qb1#
      • 1...Sf1
        • 2.Qh7#
      • 1...Sg4
        • 2.Qh7#
      • 1...b3
        • 2.Sc3#
      • 1...Bxd6!
    • 1.g3?
      • threat
        • 2.Sd2#
      • 1...Sgxf3
        • 2.Qb1#
      • 1...Shxf3
        • 2.Qh7#
      • 1...Bxg5!
  • Keys
    • 1.g4!
      • threat
        • 2.Sd2#
      • 1...Bxg5
        • 2.Sg3#
      • 1...Sgxf3
        • 2.Qb1#
      • 1...Shxf3
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 7
  • Sets
    • B(f);N_GUARD::S(B),XB(f)
    • B(f);OGATE,XB(F)::R1(G),XB(f)
    • B(f);N_GUARD,XR(G)::S(B)
    • S(a);OGATE,XS(B)::QAB(A)
    • S(a);OGATE,XS(D)::QAB(A)
    • S(a);OGATE::QAB(A)
    • S(b);OGATE::QAB(A)
    • S(b);OGATE,XS(D)::QAB(A)
    • P(d);N_GUARD::S(B)
  • Tries
    • Try
      • B(F);XB(f)
      • Threat
        • R1(G)
      • Vars
        • S(a);OGATE,XS(D)::QAB(A)
        • S(b);OGATE,XS(D)::QAB(A)
        • S(b);OGATE::QAB(A)
      • Refutation
        • S(a);XS(B)
    • Try
      • B(F);
      • Vars
        • B(f);N_GUARD,XR(G)::S(B)
        • S(a);OGATE,XS(B)::QAB(A)
        • S(a);OGATE,XS(D)::QAB(A)
        • S(b);OGATE,XS(D)::QAB(A)
        • B(f);N_GUARD::S(B),XB(f)
        • B(f);N_GUARD::R1(G),XB(f)
        • S(a);OGATE::QAB(A)
        • S(b);OGATE::QAB(A)
        • P(d);N_GUARD::S(B)
      • Refutation
        • B(f);XB(F)
    • Try
      • P(C);
      • Threat
        • QAB(A)+S(D),DCHECK
      • Vars
        • S(a);OGATE,P_SPINS(a),SBLOCK,XS(D)::QAB(A)
        • S(b);OGATE,P_SPINS(b),SBLOCK,XS(D)::QAB(A)
      • Refutation
        • B(f);XR(G)
  • Actual
    • P(C);
    • Threat
      • QAB(A)+S(D),DCHECK
    • Vars
      • B(f);N_GUARD,XR(G)::S(B)
      • S(a);OGATE,P_SPINS(a),SBLOCK,XS(D)::QAB(A)
      • S(b);OGATE,P_SPINS(b),SBLOCK,XS(D)::QAB(A)
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