MESON Chess Problem Database

Problem Display
PID: 172173 (4r3/1b1Q1N1p/5R1K/2p3p1/p1P1k2n/r3P3/7p/3NR1q1 w - - 0 1)

Shire, David J

The Problemist Supplement, 2017

4r3/1b1Q1N1p/5R1K/2p3p1/p1P1k2n/r3P3/7p/3NR1q1

#2

8 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qf2
      • 2.Sxf2#
    • 1...Qxe3
      • 2.Sf2#
    • 1...Qh1
      • 2.Sf2#
    • 1...Qg4
      • 2.Sf2#
    • 1...Ra1
      • 2.Sc3#
    • 1...Ra2
      • 2.Sc3#
    • 1...Rc3
      • 2.Sxc3#
    • 1...Rd3
      • 2.Qxe8#
    • 1...Rxe3
      • 2.Sc3#
    • 1...Bd5
      • 2.Qxd5#
    • 1...Ba6
      • 2.Qd5#
    • 1...Bc8
      • 2.Qd5#
    • 1...Sg2
      • 2.Qf5#
    • 1...Sf3
      • 2.Qf5#
    • 1...Sf5+
      • 2.Qxf5#
    • 1...Sg6
      • 2.Qf5#
    • 1...g4
      • 2.Rf4#
  • Tries
    • 1.Sxg5+?
      • 1...Ke5
        • 2.Qd6#
      • 1...Qxg5+!
    • 1.Qg4+?
      • 1...Qxg4
        • 2.Sf2#
      • 1...Kd3!
  • Keys
    • 1.Sb2!
      • threat
        • 2.Qxe8#
        • 2.Qxb7#
      • 1...Sf5+
        • 2.Qxf5#
      • 1...Qxe3
        • 2.Qg4#
      • 1...Qxe1
        • 2.Qxe8#
      • 1...Rxe3
        • 2.Qd3#
      • 1...Qg3
        • 2.Qxb7#
      • 1...Qg4
        • 2.Qxg4#
        • 2.Qxb7#
      • 1...Rb3
        • 2.Qxe8#
      • 1...Rd3
        • 2.Qxe8#
        • 2.Qxd3#
      • 1...Re5
        • 2.Sd6#
      • 1...Re6
        • 2.Qxe6#
      • 1...Re7
        • 2.Qxe7#
      • 1...Ra8
        • 2.Qe6#
        • 2.Qxb7#
        • 2.Qe7#
      • 1...Rb8
        • 2.Qe6#
        • 2.Qe7#
      • 1...Rc8
        • 2.Qe6#
        • 2.Qe7#
      • 1...Rd8
        • 2.Qe6#
        • 2.Qe7#
      • 1...Rf8
        • 2.Qe6#
        • 2.Qxb7#
        • 2.Qe7#
      • 1...Rg8
        • 2.Qe6#
        • 2.Qxb7#
        • 2.Qe7#
      • 1...Rh8
        • 2.Qe6#
        • 2.Qxb7#
        • 2.Qe7#
      • 1...Bd5
        • 2.Qxd5#
      • 1...Ba6
        • 2.Qc6#
        • 2.Qxe8#
        • 2.Qd5#
      • 1...Bc6
        • 2.Qxc6#
      • 1...Ba8
        • 2.Qxe8#
      • 1...Bc8
        • 2.Qc6#
        • 2.Qd5#
      • 1...Sf3
        • 2.Qf5#
        • 2.Qxb7#
      • 1...Sg6
        • 2.Qf5#
        • 2.Qxb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 8
    • REMOVED MATES = 13
  • Sets
    • Q(a);N_GUARD::S(A),XQ(a)
    • Q(a);N_GUARD,P_SPINQ(a),XP(C)::S(A)
    • Q(a);N_GUARD::S(A)
    • R(c);N_GUARD::S(A)
    • R(c);N_GUARD::S(A),XR(c)
    • R(c);SBLOCK::QAR(G),XR(k)
    • R(c);N_GUARD,P_SPINR(c),XP(C)::S(A)
    • B(i);N_GUARD::QAB1(G),XB(i)
    • B(i);N_GUARD::QAB1(G)
    • S(f);N_GUARD::QAB1(G)
    • S(f);CHECK,N_GUARD::QAB1(G),XS(f)
    • P(h);N_GUARD::R1(E)
  • Tries
    • Try
      • S(H);CHECK,XP(h)
      • Vars
        • K(e);P-FLIGHT::QAB1(G)
      • Refutation
        • Q(a);CHECK,XS(H)
    • Try
      • Q(G);CHECK
      • Vars
        • Q(a);XQ(G)::S(A)
      • Refutation
        • K(e);S_FLIGHT
  • Actual
    • S(A);
    • Threat
      • DUALS(2)
    • Vars
      • S(f);CHECK,N_GUARD::QAB1(G),XS(f)
      • Q(a);N_GUARD,P_SPINQ(a),XP(C)::QAR2(G)
      • Q(a);XR(B)::QAR(G),XR(k)
      • R(c);N_GUARD,P_SPINR(c),XP(C)::QAB1(G)
      • Q(a);::QAB(G),XB(i)
      • R(c);::QAR(G),XR(k)
      • R(k);SBLOCK::S(H)
      • R(k);N_GUARD,P_PINR(E)::QAR2(G),XR(k)
      • R(k);N_GUARD::QAR(G),XR(k)
      • B(i);N_GUARD::QAB1(G),XB(i)
      • B(i);N_GUARD::QAB(G),XB(i)
      • B(i);::QAR(G),XR(k)
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