MESON Chess Problem Database

Problem Display
PID: 133957 (2b5/2K1p3/1p6/n1Np4/Rn1k4/2qNp3/B1P5/B2Q4 w - - 0 1)

Morra, Juan Carlos

The Field, 1963

(First published on Thu Mar 21 1963)

2b5/2K1p3/1p6/n1Np4/Rn1k4/2qNp3/B1P5/B2Q4

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa1
      • 2.Qxa1#
    • 1...Qb2
      • 2.Bxb2#
    • 1...Bg4
      • 2.Qxg4#
    • 1...Ba6
      • 2.Qg4#
    • 1...Bb7
      • 2.Qg4#
    • 1...Sb3
      • 2.Rxb4#
    • 1...Sb7
      • 2.Rxb4#
    • 1...e2
      • 2.Qg1#
    • 1...e6
      • 2.Qg4#
  • Tries
    • 1.Kxc8?
      • threat
        • 2.Qg4#
      • 1...Qxa1
        • 2.Qxa1#
      • 1...Qb2
        • 2.Bxb2#
      • 1...e2
        • 2.Qg1#
      • 1...e5!
    • 1.Sxb4+?
      • 1...Kxc5
        • 2.Qxd5#
      • 1...Ke5!
    • 1.Qf3?
      • threat
        • 2.Qxd5#
        • 2.Qf4#
      • 1...Qb2
        • 2.Bxb2#
      • 1...Sb3
        • 2.Rxb4#
        • 2.Qf4#
      • 1...Bf5
        • 2.Qxd5#
      • 1...Be6
        • 2.Qf4#
      • 1...Bb7
        • 2.Qg4#
        • 2.Qf4#
      • 1...Sc4
        • 2.Sb3#
        • 2.Qf4#
      • 1...e2
        • 2.Qf2#
        • 2.Qf4#
      • 1...e5
        • 2.Qxd5#
      • 1...e6
        • 2.Qg4#
        • 2.Qf4#
      • 1...Qxa1!
    • 1.Qe1?
      • threat
        • 2.Bxc3#
        • 2.Qxc3#
      • 1...Qxa1
        • 2.Qxa1#
      • 1...Sb3
        • 2.Rxb4#
        • 2.Qxc3#
      • 1...e2
        • 2.Qf2#
        • 2.Qg1#
      • 1...Qb2
        • 2.Bxb2#
      • 1...bxc5!
  • Keys
    • 1.Qh1!
      • threat
        • 2.Qxd5#
      • 1...Qxa1
        • 2.Qxa1#
      • 1...Qb2
        • 2.Bxb2#
      • 1...Sb3
        • 2.Rxb4#
      • 1...e2
        • 2.Qg1#
      • 1...Be6
        • 2.Qh8#
      • 1...Bb7
        • 2.Qh4#
      • 1...Sc4
        • 2.Sb3#
      • 1...e6
        • 2.Qh4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(a);N_PINS(G),N_SPINQ(a),OGATE,XB(A)::QAB(B),XQ(a)
    • Q(a);N_PINS(G),OGATEB::B(A),XQ(a)
    • B(i);N_GUARD::QAR(B),XB(i)
    • B(i);N_GUARD::QAR(B)
    • S(e);N_GUARD::R(F),XS(c)
    • P(b);OGATEB::QAB(B)
    • P(h);S_CUTB(i)::QAR(B)
  • Tries
    • Try
      • K(H);P-FLIGHT,XB(i)
      • Threat
        • QAR(B)
      • Vars
        • Q(a);N_PINS(G),N_SPINQ(a),OGATE,XB(A)::QAB(B),XQ(a)
        • Q(a);N_PINS(G),OGATEB::B(A),XQ(a)
        • P(b);OGATEB::QAB(B)
      • Refutation
        • P(h);
    • Try
      • S(E);CHECK,XS(c)
      • Vars
        • K(d);N_SPINQ(a),OGATE,S_FLIGHT,XS(G)::QAR1(B),XP(f)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);N_PINS(G),OGATEB::B(A),XQ(a)
        • B(i);::QAR1(B),XP(f)
        • B(i);::QAR2(B)
        • P(h);::QAR1(B),XP(f)
      • Refutation
        • Q(a);N_PINS(G),N_SPINQ(a),XB(A)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);N_PINS(G),N_SPINQ(a),OGATE,XB(A)::QAB(B),XQ(a)
        • Q(a);N_PINS(G),OGATEB::B(A),XQ(a)
      • Refutation
        • P(g);XS(G)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B),XP(f)
    • Vars
      • Q(a);N_PINS(G),N_SPINQ(a),OGATE,XB(A)::QAB(B),XQ(a)
      • Q(a);N_PINS(G),OGATEB::B(A),XQ(a)
      • S(e);N_GUARD::R(F),XS(c)
      • P(b);OGATEB::QAB(B)
      • B(i);S_CUTP(h)::QAB(B)
      • B(i);N_GUARD::QAR(B)
      • S(e);N_PINS(G),N_SPINS(c),SBLOCK::S(G)
      • P(h);S_CUTB(i)::QAR(B)
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