MESON Chess Problem Database

Problem Display
PID: 185285 (1Q4K1/2pR1RB1/2Br4/p2qP3/4k1Pp/n3P2r/1N4P1/1b3N2 w - - 0 1)

Erokhin, Vladimir Alekseevich

Suomen Shakki, 1981

1Q4K1/2pR1RB1/2Br4/p2qP3/4k1Pp/n3P2r/1N4P1/1b3N2

#2

12 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rf3
      • 2.gxf3#
    • 1...Re6
      • 2.Bxd5#
      • 2.Rf4#
    • 1...Rg6
      • 2.Bxd5#
    • 1...Rh6
      • 2.Bxd5#
  • Tries
    • 1.Bxd5+?
      • 1...Rxd5
        • 2.Rf4#
      • 1...Kxd5!
    • 1.Qb4+?
      • 1...Sc4
        • 2.Qxc4#
      • 1...axb4!
    • 1.e6?
      • threat
        • 2.Rf4#
      • 1...Rxe3
        • 2.Sd2#
      • 1...Rf3
        • 2.gxf3#
      • 1...Qxc6!
  • Keys
    • 1.Qb3!
      • threat
        • 2.Sd2#
      • 1...Qxc6
        • 2.Rf4#
      • 1...Rxe3
        • 2.Qxe3#
      • 1...Rxc6
        • 2.Qxd5#
      • 1...Rf6
        • 2.Qxd5#
      • 1...Bd3
        • 2.Qxd3#
      • 1...Sc4
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • R(c);OGATE::P(C),XR(c)
    • R(h);N_GUARD,P_PINB(J)::B(G),XQ(g)
    • R(h);N_GUARD::B(G),XQ(g)
  • Tries
    • Try
      • B(G);CHECK,N_SPINR(I),XQ(g)
      • Vars
        • R(h);XB(G)::R1(I)
      • Refutation
        • K(d);P_SPINR(h),S_FLIGHT,XB(G)
    • Try
      • Q(K);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR2(K),XS(b)
      • Refutation
        • P(f);XQ(K)
    • Try
      • P(F);N_SPINR(I)
      • Threat
        • R1(I)
      • Vars
        • R(c);SBLOCK,XP(D)::S(A)
        • R(c);OGATE::P(C),XR(c)
      • Refutation
        • Q(g);N_SPINQ(g),XB(G)
  • Actual
    • Q(K);
    • Threat
      • S(A)
    • Vars
      • Q(g);N_PINR(I),N_SPINQ(g),XB(G)::R1(I)
      • R(c);OGATE,XP(D)::QAR1(K),XR(c)
      • R(h);N_GUARD,N_SPINQ(g),XB(G)::QAB1(K),XQ(g)
      • R(h);N_GUARD::QAB1(K),XQ(g)
      • B(a);N_GUARD::QAB1(K),XB(a)
      • S(b);N_GUARD::QAR2(K),XS(b)
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