MESON Chess Problem Database

Problem Display
PID: 237822 (b4K2/6NB/6N1/5R2/1P2k3/n1P3B1/5P2/4bQnq w - - 0 1)

Shanshin, Valery Yurevich

Shakhmaty v SSSR, 1986

b4K2/6NB/6N1/5R2/1P2k3/n1P3B1/5P2/4bQnq

#2

10 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bd5
      • 2.Rf4#
    • 1...Se2
      • 2.Qxe2#
    • 1...Sf3
      • 2.Qe2#
    • 1...Sh3
      • 2.Qe2#
    • 1...Sb1
      • 2.Qc4#
    • 1...Sc4
      • 2.Qxc4#
  • Tries
    • 1.Sf4?
      • threat
        • 2.Qd3#
      • 1...Qf3
        • 2.Ra5#
        • 2.Rb5#
        • 2.Rc5#
        • 2.Rd5#
        • 2.Rg5#
        • 2.Rh5#
      • 1...Se2
        • 2.Qxe2#
        • 2.Qxh1#
      • 1...Kf3!
    • 1.Se5?
      • threat
        • 2.Qd3#
      • 1...Kd5
        • 2.Qd3#
      • 1...Se2
        • 2.Qxh1#
      • 1...Qf3!
    • 1.Qxe1+?
      • 1...Se2
        • 2.Qxe2#
      • 1...Kd3!
    • 1.f3+?
      • 1...Ke3
        • 2.Bf4#
      • 1...Sxf3
        • 2.Qe2#
      • 1...Qxf3!
  • Keys
    • 1.Rd5!
      • threat
        • 2.Qd3#
      • 1...Qf3+
        • 2.Sf4#
      • 1...Kf3
        • 2.Se5#
      • 1...Kxd5
        • 2.Se7#
      • 1...Bxd5
        • 2.Sh4#
      • 1...Se2
        • 2.Qxh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • B(f);SBLOCK::R1(F)
    • S(b);N_GUARD::QAR2(A),XS(b)
    • S(b);N_GUARD::QAR2(A)
    • S(d);N_GUARD::QAR2(A)
    • S(d);N_GUARD::QAR2(A),XS(d)
  • Tries
    • Try
      • S(G);
      • Threat
        • QAB1(A)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • S(G);
      • Threat
        • QAB1(A)
      • Vars
        • K(e);S_FLIGHT::QAR2(A)
        • S(b);OGATE::QAB(A),XQ(c)
      • Refutation
        • Q(c);P_PINR(F)
    • Try
      • Q(A);CHECK,XB(a)
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR2(A),XS(b)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • P(B);CHECK
      • Vars
        • K(e);P-FLIGHT::B(D)
        • S(b);XP(B)::QAR2(A)
      • Refutation
        • Q(c);P_PINR(F),XP(B)
  • Actual
    • R(F);
    • Threat
      • QAB1(A)
    • Vars
      • Q(c);CHECK,N_GUARD,SBLOCK::B(I)+S(G)
      • K(e);S_FLIGHT::S(G)
      • K(e);S_FLIGHT,XR(F)::S(G)
      • B(f);SBLOCK,XR(F)::B(I)+S(G)
      • S(b);OGATE::QAB(A),XQ(c)
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