MESON Chess Problem Database

Problem Display
PID: 57736 (4N2k/2P1K3/4B1P1/2p4N/n2q4/2B3P1/1Q6/b7 w - - 0 1)

Rietveld, Johannes Jacob

Chess Life, 1957

4N2k/2P1K3/4B1P1/2p4N/n2q4/2B3P1/1Q6/b7

#2

9 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Bxe5#
    • 1...Qf6+
      • 2.Bxf6#
    • 1...Qg7+
      • 2.Bxg7#
    • 1...c4
      • 2.Bxd4#
  • Tries
    • 1.Sd6?
      • threat
        • 2.Qb8#
        • 2.c8Q#
        • 2.c8R#
      • 1...Qf6+
        • 2.Bxf6#
      • 1...Qg7+
        • 2.Bxg7#
      • 1...Qxc3
        • 2.Qb8#
        • 2.c8Q#
        • 2.c8R#
      • 1...Bxb2
        • 2.c8Q#
        • 2.c8R#
      • 1...Sxb2
        • 2.c8Q#
        • 2.c8R#
      • 1...Sxc3
        • 2.Qb8#
        • 2.c8Q#
        • 2.c8R#
      • 1...Qe5
        • 2.Bxe5#
        • 2.Qb8#
        • 2.c8Q#
        • 2.c8R#
      • 1...c4
        • 2.Bxd4#
        • 2.Qb8#
        • 2.c8Q#
        • 2.c8R#
      • 1...Sb6!
    • 1.Qf2?
      • threat
        • 2.Qf8#
      • 1...Qf6+
        • 2.Qxf6#
      • 1...Qg7+!
    • 1.Qb8?
      • threat
        • 2.Sd6#
      • 1...Qf6+
        • 2.Sexf6#
      • 1...Qg7+
        • 2.Sexg7#
      • 1...Sb6!
    • 1.c8Q?
      • threat
        • 2.Sd6#
        • 2.Sc7#
      • 1...Qf6+
        • 2.Sexf6#
        • 2.Bxf6#
      • 1...Qg7+
        • 2.Sexg7#
        • 2.Bxg7#
      • 1...Sxc3
        • 2.Sd6#
      • 1...Sb6!
    • 1.c8R?
      • threat
        • 2.Sd6#
        • 2.Sc7#
      • 1...Qf6+
        • 2.Sexf6#
        • 2.Bxf6#
      • 1...Qg7+
        • 2.Sexg7#
        • 2.Bxg7#
      • 1...Sxc3
        • 2.Sd6#
      • 1...Sb6!
  • Keys
    • 1.Qh2!
      • threat
        • 2.Sf4#
      • 1...Qf6+
        • 2.Shxf6#
      • 1...Qg7+
        • 2.Shxg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • Q(c);OGATE,P_PINB(E)::B(B),XQ(c)
    • Q(c);CHECK,OGATE::B(B),XQ(c)
    • P(d);N_GUARD::B(B),XQ(c)
  • Tries
    • Try
      • S(I);
      • Threat
        • DUALS(3)
      • Vars
        • Q(c);CHECK,OGATE::B(B),XQ(c)
        • B(a);XQ(A)::P=Q
        • S(b);XQ(A)::P=Q
      • Refutation
        • S(b);
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • Q(c);CHECK,N_GUARD::QAB(A),XQ(c)
      • Refutation
        • Q(c);CHECK
    • Try
      • Q(A);
      • Threat
        • QAR(A)+S(I)
      • Vars
        • Q(c);CHECK,N_GUARD::QAR(A)+S(I),XQ(c)
      • Refutation
        • S(b);
    • Try
      • P(G);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);N_SPINQ(c),XB(B)::QAR(G)+S(I)
      • Refutation
        • S(b);
    • Try
      • P(G);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);N_SPINQ(c),XB(B)::R(G)+S(I)
      • Refutation
        • S(b);
  • Actual
    • Q(A);
    • Threat
      • QAR(A)+S(D)
    • Vars
      • Q(c);CHECK,N_GUARD::QAR(A)+S(D),XQ(c)
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