MESON Chess Problem Database

Problem Display
PID: 147217 (3q4/2B4b/NR2pP1b/1rpk1r1N/5pB1/1P2PP2/R2n4/Qn4K1 w - - 0 1)

Yakovlev, Yuri Nikolayevich

Canadian Chess Chat, 1983

3q4/2B4b/NR2pP1b/1rpk1r1N/5pB1/1P2PP2/R2n4/Qn4K1

#2

12 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf6
      • 2.Rd6#
    • 1...Qxc7
      • 2.Sxc7#
    • 1...Qd6
      • 2.Rxd6#
    • 1...Qa8
      • 2.Rd6#
    • 1...Qb8
      • 2.Rd6#
    • 1...Qc8
      • 2.Rd6#
    • 1...Qe8
      • 2.Rd6#
    • 1...Qg8
      • 2.Rd6#
    • 1...Qh8
      • 2.Rd6#
    • 1...Re5
      • 2.Qxe5#
    • 1...Rg5
      • 2.Sxf4#
    • 1...Rxh5
      • 2.Bxe6#
    • 1...Rxf6
      • 2.Qe5#
    • 1...Sa3
      • 2.Rxd2#
    • 1...Sc3
      • 2.Rxd2#
    • 1...Sf1
      • 2.e4#
    • 1...Sxf3+
      • 2.Bxf3#
    • 1...Sc4
      • 2.e4#
    • 1...c4
      • 2.Qd4#
  • Tries
    • 1.Sxf4+?
      • 1...Rxf4
        • 2.Bxe6#
        • 2.Qe5#
      • 1...Bxf4!
    • 1.Sb4+?
      • 1...cxb4
        • 2.Qd4#
      • 1...Rxb4!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Qd3#
      • 1...Sxf3+
        • 2.Bxf3#
      • 1...Qxf6
        • 2.Rd6#
      • 1...Qxc7
        • 2.Sxc7#
      • 1...Rxb3
        • 2.Qxc5#
      • 1...Rxb6
        • 2.Qxc5#
      • 1...Rxh5
        • 2.Bxe6#
      • 1...Rxf6
        • 2.Qe5#
      • 1...Sxc3
        • 2.Rxd2#
      • 1...Sxb3
        • 2.e4#
      • 1...Qd6
        • 2.Rxd6#
      • 1...Rb4
        • 2.Qxc5#
      • 1...Re5
        • 2.Qxe5#
      • 1...Rg5
        • 2.Sxf4#
      • 1...c4
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 9
  • Sets
    • Q(k);N_GUARD,XP(K)::R1(J)
    • Q(k);XB(L)::S(I),XQ(k)
    • Q(k);N_GUARD::R1(J),XQ(k)
    • Q(k);N_GUARD::R1(J)
    • Q(k);N_GUARD,P_PINB(G)::R1(J)
    • R(g);N_GUARD::QAR1(A),XR(g)
    • R(g);N_GUARD,P_PINB(G),S_CUTB(i)::S(H),XP(c)
    • R(g);OGATE,XS(H)::B(G),XP(h)
    • R(g);N_GUARD,XP(K)::QAR1(A)
    • S(a);N_GUARD::R(C),XS(b)
    • S(b);N_GUARD::P(E)
    • S(b);CHECK,OGATE,XP(F)::B(G),XS(b)
    • P(e);N_GUARD::QAR1(A)
  • Tries
    • Try
      • S(H);CHECK,XP(c)
      • Refutation
        • B(i);XS(H)
    • Try
      • S(I);CHECK
      • Vars
        • P(e);XS(I)::QAR1(A)
      • Refutation
        • R(d);XS(I)
  • Actual
    • Q(A);
    • Threat
      • QAR2(A)
    • Vars
      • S(b);CHECK,OGATE,XP(F)::B(G),XS(b)
      • Q(k);N_GUARD,XP(K)::R1(J)
      • Q(k);XB(L)::S(I),XQ(k)
      • R(d);N_GUARD,XP(D)::QAR1(A),XP(e)
      • R(d);N_GUARD,XR(J)::QAR1(A),XP(e)
      • R(g);OGATE,XS(H)::B(G),XP(h)
      • R(g);N_GUARD,XP(K)::QAR1(A)
      • S(a);N_GUARD,XQ(A)::R(C),XS(b)
      • S(b);N_GUARD,XP(D)::P(E)
      • Q(k);N_GUARD::R1(J),XQ(k)
      • R(d);N_GUARD::QAR1(A),XP(e)
      • R(g);N_GUARD::QAR1(A),XR(g)
      • R(g);N_GUARD,P_PINB(G),S_CUTB(i)::S(H),XP(c)
      • P(e);N_GUARD::QAR1(A)
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