MESON Chess Problem Database

Problem Display
PID: 242363 (1n6/R3p1Q1/2p1B1K1/1P2R3/3k1p2/P3p3/1nP5/4B3 w - - 0 1)

Morra, Juan Carlos

Source?, 1960

1n6/R3p1Q1/2p1B1K1/1P2R3/3k1p2/P3p3/1nP5/4B3

#2

9 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Ra4#
    • 1...Sd3
      • 2.c3#
    • 1...Sa4
      • 2.Rxa4#
    • 1...Sa6
      • 2.Rd7#
    • 1...Sd7
      • 2.Rxd7#
  • Tries
    • 1.Rd5+?
      • 1...Kc4
        • 2.Rf5#
        • 2.Rg5#
        • 2.Rh5#
        • 2.Qc3#
        • 2.Qd4#
      • 1...Ke4!
    • 1.Ra4+?
      • 1...Sc4
        • 2.Rxc4#
      • 1...Sxa4!
    • 1.Qf6?
      • threat
        • 2.Qxf4#
      • 1...Sd3
        • 2.c3#
      • 1...f3
        • 2.Qf4#
      • 1...exf6!
    • 1.Qxe7?
      • threat
        • 2.Qc5#
        • 2.Qd6#
      • 1...Sc4
        • 2.Qc5#
      • 1...Sd3
        • 2.Qd6#
      • 1...Sa4
        • 2.Qd6#
      • 1...Sa6
        • 2.Qd6#
      • 1...Sd7
        • 2.Qd6#
      • 1...c5
        • 2.Qxc5#
        • 2.Qd6#
      • 1...Kxe5!
  • Keys
    • 1.Kf5!
      • 1...cxb5
        • 2.Rxb5#
      • 1...Sd1
        • 2.Ra4#
      • 1...Sd3
        • 2.c3#
      • 1...Sa4
        • 2.Rxa4#
      • 1...Sc4
        • 2.Rd5#
      • 1...Sa6
        • 2.Rd7#
      • 1...Sd7
        • 2.Rxd7#
      • 1...e2
        • 2.Qg1#
      • 1...f3
        • 2.Qg4#
      • 1...c5
        • 2.Re4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::R(H)
    • S(a);SBLOCK::P(B)
    • S(a);N_GUARD::R(H),XS(a)
    • S(g);N_GUARD::R(H)
    • S(g);N_GUARD::R(H),XS(g)
  • Tries
    • Try
      • R(E);CHECK
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • R(H);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::R1(H),XS(a)
      • Refutation
        • S(a);XR(H)
    • Try
      • Q(I);
      • Threat
        • QAR2(I),XP(d)
      • Vars
        • S(a);SBLOCK::P(B)
        • P(d);::QAR2(I)
      • Refutation
        • P(f);XQ(I)
    • Try
      • Q(I);XP(f)
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::QAB1(I)
        • S(a);::QAR2(I)
        • S(g);::QAR2(I)
      • Refutation
        • K(c);S_FLIGHT,XR(E)
  • Actual
    • K(G);S_FLIGHT
    • Vars
      • P(e);OGATE,XP(D)::QAB(I)+R(E),XP(e)
      • S(a);N_GUARD::R(H)
      • S(a);SBLOCK::P(B)
      • S(a);N_GUARD::R(H),XS(a)
      • S(a);SBLOCK::QAB(I)+R(E),DCHECK
      • S(g);N_GUARD::R(H)
      • S(g);N_GUARD::R(H),XS(g)
      • P(b);OGATEB::QAB(I)
      • P(d);OGATEB::QAR(I)
      • P(e);SBLOCK::QAB(I)+R(E),DCHECK
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