MESON Chess Problem Database

Problem Display
PID: 49711 (6b1/B1Pp4/Q2Rq1B1/1N2r3/3PR1n1/P1pkNP2/2p5/2n1K3 w - - 0 1)

Rice, John Michael

1st HM., Die Schwalbe, 1970

6b1/B1Pp4/Q2Rq1B1/1N2r3/3PR1n1/P1pkNP2/2p5/2n1K3

#2

12 + 9

5174 Chess Problem Spectrum 2003

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Rxe5#
    • 1...Qb3
      • 2.Rxe5#
    • 1...Qc4
      • 2.Rxe5#
    • 1...Qe7
      • 2.Rxe5#
    • 1...Rxb5
      • 2.Rexe6#
  • Tries
    • 1.Rxe5+?
      • 1...Qf5
        • 2.Bxf5#
      • 1...Qxg6!
    • 1.dxe5+?
      • 1...Qd5
        • 2.Ra4#
        • 2.Rb4#
        • 2.Rc4#
        • 2.Rf4#
        • 2.Rxg4#
      • 1...Qxd6!
  • Keys
    • 1.d5!
      • threat
        • 2.Sd4#
      • 1...Qxd5
        • 2.Rxe5#
      • 1...Qxd6
        • 2.Sxd6#
      • 1...Rxe4
        • 2.dxe6#
      • 1...Rxd5
        • 2.Rexe6#
      • 1...Sxe3
        • 2.Rd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • Q(g);N_GUARD::B(J)+R(F),XR(f)
    • R(f);OGATE,P_SPINR(f),XS(G)::B(J)+R(F),XQ(g)
  • Tries
    • Try
      • R(F);CHECK,XR(f)
      • Vars
        • Q(g);N_GUARD,P_SPINQ(g)::B(J),XQ(g)
      • Refutation
        • Q(g);XB(J)
    • Try
      • P(E);CHECK,XR(f)
      • Refutation
        • Q(g);XR(I)
  • Actual
    • P(E);
    • Threat
      • QAB(H)+S(G)
    • Vars
      • Q(g);N_GUARD,P_SPINQ(g),XP(E)::B(J)+R(F),XR(f)
      • Q(g);XR(I)::QAB(H)+S(G),XQ(g)
      • R(f);N_GUARD,P_PINS(C),P_SPINR(f),XR(F)::R(I)+P(E),XQ(g)
      • R(f);OGATE,P_SPINR(f),XP(E)::B(J)+R(F),XQ(g)
      • S(e);SBLOCK,XS(C)::B(J)+R(F),DCHECK
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