MESON Chess Problem Database

Problem Display
PID: 267650 (R1r1n1N1/1rpB4/5p2/2k2p2/1pPp4/1P1K4/8/4Q3 w - - 0 1)

Lois, Jorge Joaquin

diagrammes, 1976

R1r1n1N1/1rpB4/5p2/2k2p2/1pPp4/1P1K4/8/4Q3

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Kb6
      • 2.Qxb4#
    • 1...Kd6
      • 2.Qe7#
  • Tries
    • 1.Ra5+?
      • 1...Kb6
        • 2.Qxb4#
      • 1...Kd6
        • 2.Rd5#
        • 2.Qe6#
        • 2.Qe7#
      • 1...Rb5!
    • 1.Qf2?
      • threat
        • 2.Qxd4#
      • 1...Kd6
        • 2.Qxd4#
      • 1...Kb6!
    • 1.Qg1?
      • threat
        • 2.Qxd4#
      • 1...Kd6
        • 2.Qxd4#
      • 1...Kb6!
    • 1.Qh1?
      • threat
        • 2.Qc6#
      • 1...Kb6
        • 2.Qc6#
      • 1...Kd6
        • 2.Qd5#
      • 1...Rb6
        • 2.Qd5#
      • 1...c6!
    • 1.Qe4?
      • threat
        • 2.Qc6#
        • 2.Qxd4#
      • 1...Kb6
        • 2.Qc6#
      • 1...Kd6
        • 2.Qd5#
        • 2.Qxd4#
        • 2.Qe7#
      • 1...Rb6
        • 2.Qd5#
        • 2.Qxd4#
      • 1...c6
        • 2.Qxd4#
      • 1...fxe4+!
    • 1.Qe5+?
      • 1...Kb6
        • 2.Qa5#
        • 2.Qb5#
        • 2.c5#
      • 1...fxe5!
    • 1.Qe7+?
      • 1...Kb6
        • 2.Qxb4#
        • 2.c5#
      • 1...Sd6!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qxd4#
      • 1...Kb6
        • 2.Qa5#
      • 1...Kd6
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(c);N_GUARD,S_CUTR(f),S_FLIGHT::QAR2(A),XP(a)
    • K(c);N_GUARD,S_CUTS(i),S_FLIGHT::QAB1(A)
  • Tries
    • Try
      • R(F);CHECK
      • Vars
        • K(c);N_GUARD,S_FLIGHT::QAR2(A),XP(a)
      • Refutation
        • R(f);P_SPINR(f)
    • Try
      • Q(A);P_PINP(b)
      • Threat
        • QAB1(A),XP(b)
      • Vars
        • K(c);N_SPINP(b),S_FLIGHT::QAR2(A),XP(b)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(A);P_PINP(b)
      • Threat
        • QAB1(A),XP(b)
      • Vars
        • K(c);N_SPINP(b),S_FLIGHT::QAR2(A),XP(b)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(c);S_FLIGHT::QAR1(A)
        • K(c);N_GUARD,S_FLIGHT::QAR1(A)
        • R(f);SBLOCK::QAR1(A)
      • Refutation
        • P(g);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • K(c);S_FLIGHT::QAR1(A)
        • P(g);::QAB1(A),XP(b)
      • Refutation
        • P(d);CHECK,XQ(A)
    • Try
      • Q(A);CHECK
      • Refutation
        • P(e);XQ(A)
    • Try
      • Q(A);CHECK
      • Refutation
        • S(i);P_SPINS(i)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A),XP(b)
    • Vars
      • K(c);N_GUARD,S_CUTR(f),S_FLIGHT::QAB1(A)
      • K(c);S_FLIGHT::QAR2(A),XP(b)
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