MESON Chess Problem Database

Problem Display
PID: 51507 (1Q1br3/2rN4/p6q/2BP2nR/2K1k1B1/p2p2P1/8/1n3N2 w - - 0 1)

Morra, Juan Carlos

The Guardian, 1962

1Q1br3/2rN4/p6q/2BP2nR/2K1k1B1/p2p2P1/8/1n3N2

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc5+
      • 2.Sxc5#
    • 1...Rc6
      • 2.Qf4#
    • 1...Ra7
      • 2.Qf4#
    • 1...Rb7
      • 2.Qf4#
    • 1...Rxd7
      • 2.Qf4#
    • 1...Rc8
      • 2.Qf4#
    • 1...Sd2+
      • 2.Sxd2#
    • 1...Sc3
      • 2.Sd2#
    • 1...Sf3
      • 2.Bf5#
    • 1...Se6
      • 2.Re5#
    • 1...d2
      • 2.Qxb1#
  • Tries
    • 1.Qxb1?
      • threat
        • 2.Sd2#
        • 2.Qxd3#
        • 2.Qe1#
      • 1...Rxd7
        • 2.Qe1#
      • 1...Sf3
        • 2.Bf5#
        • 2.Qxd3#
      • 1...Sh3
        • 2.Qxd3#
      • 1...Se6
        • 2.Re5#
        • 2.Qxd3#
      • 1...Sf7
        • 2.Qxd3#
      • 1...Sh7
        • 2.Qxd3#
      • 1...Rxc5+!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Qe1#
      • 1...Rxc5+
        • 2.Kxc5#
      • 1...Sd2+
        • 2.Sxd2#
      • 1...Sc3
        • 2.Sd2#
      • 1...Sf3
        • 2.Bf5#
      • 1...Sh3
        • 2.Kb3#
      • 1...Se6
        • 2.Re5#
      • 1...Sf7
        • 2.Kb3#
      • 1...Sh7
        • 2.Kb3#
      • 1...d2
        • 2.Qxb1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • R(h);CHECK,XB(E)::S(H),XR(h)
    • R(h);OGATE::QAR1(I)
    • R(h);N_PINB(E),OGATE::QAR1(I)
    • R(h);N_PINB(E),OGATE,XS(H)::QAR1(I)
    • S(a);CHECK,N_GUARD::S(A),XS(a)
    • S(a);N_GUARD::S(A)
    • S(e);SBLOCK::B(D)
    • S(e);OGATE::R1(G)
    • P(c);OGATEB::QAB(I),XS(a)
  • Tries
    • Try
      • Q(I);P_PINP(c),XS(a)
      • Threat
        • DUALS(3)
      • Vars
        • R(h);N_PINB(E),XS(H)::QAR(I)
        • S(e);::QAB1(I),XP(c)
      • Refutation
        • R(h);CHECK,XB(E)
  • Actual
    • Q(I);
    • Threat
      • QAR(I)
    • Vars
      • R(h);CHECK,XB(E)::QAR(I)+K(C),XR(h)
      • S(a);CHECK,N_GUARD::S(A),XS(a)
      • S(a);N_GUARD::S(A)
      • S(e);SBLOCK::B(D)
      • S(e);::QAR(I)+K(C)
      • S(e);OGATE::R1(G)
      • P(c);OGATEB::QAB(I),XS(a)
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