MESON Chess Problem Database

Problem Display
PID: 50998 (4N1B1/8/K1p5/p1k1bn1R/r5b1/1p3P2/1P2N3/4Q3 w - - 0 1)

Morra, Juan Carlos

The Spectator, 1957

4N1B1/8/K1p5/p1k1bn1R/r5b1/1p3P2/1P2N3/4Q3

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rc4
      • 2.Qxa5#
    • 1...Rd4
      • 2.Qxa5#
    • 1...Re4
      • 2.Qxa5#
    • 1...Rf4
      • 2.Qxa5#
    • 1...Sg3
      • 2.Rxe5#
    • 1...Sd4
      • 2.Rxe5#
    • 1...Sh4
      • 2.Rxe5#
    • 1...Sd6
      • 2.Rxe5#
    • 1...Sh6
      • 2.Rxe5#
    • 1...Sg7
      • 2.Rxe5#
  • Tries
    • 1.Qc3+?
      • 1...Rc4
        • 2.Qxa5#
        • 2.Qxc4#
      • 1...Bxc3!
    • 1.Qc1+?
      • 1...Kb4
        • 2.Qc4#
      • 1...Rc4
        • 2.Qxc4#
      • 1...Bc3!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Sxb3#
      • 1...Kxd4
        • 2.Qc3#
      • 1...Rxd4
        • 2.Qxa5#
      • 1...Bxd4
        • 2.Qe7#
      • 1...Sxd4
        • 2.Rxe5#
      • 1...Ra3
        • 2.Qc3#
      • 1...Rb4
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 8
  • Sets
    • R(b);N_GUARD::QAR2(A),XP(d)
    • S(g);OGATE,P_SPINB(f)::R(E),XB(f)
  • Tries
    • Try
      • Q(A);CHECK
      • Refutation
        • B(f);P_SPINS(g),XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(e);S_FLIGHT::QAR1(A)
        • R(b);N_GUARD,P_SPINR(b)::QAR1(A),XR(b)
      • Refutation
        • B(f);P_SPINB(f),P_SPINS(g)
  • Actual
    • S(C);
    • Threat
      • S(C),XP(a)
    • Vars
      • K(e);S_FLIGHT,XS(C)::QAB1(A)
      • R(b);N_GUARD,SBLOCK,XS(C)::QAR2(A),XP(d)
      • B(f);OGATE,P_SPINS(g),SBLOCK,XS(C)::QAB(A)
      • S(g);OGATE,P_SPINB(f),SBLOCK,XS(C)::R(E),XB(f)
      • R(b);N_GUARD::QAR2(A)
      • R(b);SBLOCK::QAR2(A),XB(f)
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