MESON Chess Problem Database

Problem Display
PID: 152227 (4n3/4P3/1pQ1p2p/1R1rk2P/3pN1P1/5PK1/8/8 w - - 0 1)

de Jong, Leonard Nicholaas

Good Companions (May), 1914

4n3/4P3/1pQ1p2p/1R1rk2P/3pN1P1/5PK1/8/8

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb5
      • 2.Qxb5#
      • 2.f4#
    • 1...Rc5
      • 2.f4#
    • 1...Sd6
      • 2.Qxd6#
    • 1...Sf6
      • 2.Qd6#
      • 2.Qc7#
    • 1...Sc7
      • 2.Qd6#
      • 2.Qxc7#
    • 1...Sg7
      • 2.Qd6#
      • 2.Qc7#
    • 1...d3
      • 2.Qc3#
  • Tries
    • 1.Qxe8?
      • threat
        • 2.Qb8#
        • 2.Qh8#
      • 1...Rxb5
        • 2.Qxb5#
      • 1...d3
        • 2.Qh8#
      • 1...Rc5!
    • 1.Qxb6?
      • 1...Rxb5
        • 2.Qxb5#
      • 1...Rc5
        • 2.Rxc5#
        • 2.Qxc5#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Sf6
        • 2.Qc7#
        • 2.Qd6#
        • 2.Qb8#
      • 1...Sc7
        • 2.Qxc7#
        • 2.Qd6#
      • 1...Sg7
        • 2.Qc7#
        • 2.Qd6#
        • 2.Qb8#
      • 1...d3!
    • 1.Qc7+?
      • 1...Sd6
        • 2.Qxd6#
      • 1...Sxc7!
  • Keys
    • 1.Qa8!
      • 1...Rxb5
        • 2.f4#
      • 1...d3
        • 2.Qa1#
      • 1...Sd6
        • 2.Qh8#
      • 1...Rc5
        • 2.f4#
      • 1...Sf6
        • 2.Qb8#
      • 1...Sc7
        • 2.Qh8#
      • 1...Sg7
        • 2.Qb8#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(b);::P(A)
    • S(g);N_GUARD::QAB1(G),XS(g)
    • P(a);OGATEB::QAB(G)
  • Tries
    • Try
      • Q(G);XS(g)
      • Threat
        • DUALS(2)
      • Vars
        • R(b);N_SPINR(b),OGATE,XR(E)::QAR(G),XR(b)
        • P(a);::QAB(G)
      • Refutation
        • R(b);
    • Try
      • Q(G);XP(d)
      • Vars
        • R(b);N_SPINR(b),OGATE,XR(E)::QAR(G),XR(b)
        • S(g);N_GUARD::QAB1(G),XS(g)
      • Refutation
        • P(a);
    • Try
      • Q(G);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAB1(G),XS(g)
      • Refutation
        • S(g);XQ(G)
  • Actual
    • Q(G);
    • Vars
      • R(b);N_SPINR(b),XR(E)::P(A)
      • P(a);OGATEB::QAB(G)
      • S(g);OGATE::QAB(G)
      • R(b);::P(A)
      • S(g);N_GUARD::QAB(G)
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