MESON Chess Problem Database

Problem Display
PID: 182733 (q6R/1r6/4p2N/r7/2Q2B2/3RP3/2p2KP1/7k w - - 0 1)

Petite, Efren

Boletim da UBP, 1990

q6R/1r6/4p2N/r7/2Q2B2/3RP3/2p2KP1/7k

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...c1Q
      • 2.Qxc1#
    • 1...c1S
      • 2.Rd1#
      • 2.Qxc1#
    • 1...c1B
      • 2.Rd1#
      • 2.Qxc1#
    • 1...c1R
      • 2.Qxc1#
  • Tries
    • 1.Sf5+?
      • 1...Rh7
        • 2.Rxh7#
      • 1...Qxh8!
    • 1.Sf7+?
      • 1...Rh5
        • 2.Rxh5#
      • 1...Qxh8!
    • 1.Sg8+?
      • 1...Rh5
        • 2.Rxh5#
      • 1...Rh7!
    • 1.Rd7?
      • threat
        • 2.Qf1#
      • 1...c1Q
        • 2.Qxc1#
      • 1...c1R
        • 2.Qxc1#
      • 1...Qa6
        • 2.Sf5#
      • 1...Ra1
        • 2.Sg8#
      • 1...Rb1!
    • 1.Rdd8?
      • threat
        • 2.Qf1#
      • 1...c1Q
        • 2.Qxc1#
      • 1...c1R
        • 2.Qxc1#
      • 1...Ra1
        • 2.Sf7#
      • 1...Rb1
        • 2.Sf5#
      • 1...Qa6!
    • 1.Qxc2?
      • threat
        • 2.Rd1#
        • 2.Qd1#
        • 2.Qc1#
      • 1...Qa6
        • 2.Qd1#
        • 2.Qc1#
      • 1...Qc8
        • 2.Rd1#
        • 2.Qd1#
      • 1...Qd8
        • 2.Qd1#
        • 2.Qc1#
      • 1...Ra2
        • 2.Rd1#
      • 1...Rc5
        • 2.Rd1#
        • 2.Qd1#
      • 1...Rd5
        • 2.Qd1#
        • 2.Qc1#
      • 1...Rb1
        • 2.Qxb1#
      • 1...Rb2
        • 2.Rd1#
      • 1...Rc7
        • 2.Rd1#
        • 2.Qd1#
      • 1...Rd7
        • 2.Qb1#
        • 2.Qd1#
        • 2.Qc1#
      • 1...Ra1!
  • Keys
    • 1.Rd5!
      • threat
        • 2.Qf1#
      • 1...c1Q
        • 2.Qxc1#
      • 1...c1R
        • 2.Qxc1#
      • 1...Qa6
        • 2.Sf7#
      • 1...Ra1
        • 2.Rh5#
      • 1...Rb1
        • 2.Sg8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATE::QAR(E),XQ(b)
    • P(b);OGATE::QAR(E),XR(b)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • R(e);N_GUARD,P_SPINR(e)::R(H),XR(e)
      • Refutation
        • Q(f);XR(H)
    • Try
      • S(G);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::R(H),XR(c)
      • Refutation
        • Q(f);XR(H)
    • Try
      • S(G);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::R(H),XR(c)
      • Refutation
        • R(e);P_SPINR(e)
    • Try
      • R(C);
      • Threat
        • QAR2(E)
      • Vars
        • P(b);OGATE::QAR(E),XQ(b)
        • P(b);OGATE::QAR(E),XR(b)
        • Q(f);N_GUARD::R(H)+S(G)
        • R(c);N_GUARD,SBLOCK::R(H)+S(G)
      • Refutation
        • R(e);
    • Try
      • R(C);
      • Threat
        • QAR2(E)
      • Vars
        • P(b);OGATE::QAR(E),XQ(b)
        • P(b);OGATE::QAR(E),XR(b)
        • R(c);N_GUARD,SBLOCK::R(H)+S(G)
        • R(e);N_GUARD::R(H)+S(G)
      • Refutation
        • Q(f);
    • Try
      • Q(E);XP(b)
      • Threat
        • DUALS(3)
      • Vars
        • R(c);P_PINQ(E)::R(C)
        • R(e);N_GUARD::QAR(E),XR(e)
        • R(e);P_PINQ(E)::R(C)
      • Refutation
        • R(c);
  • Actual
    • R(C);
    • Threat
      • QAR2(E)
    • Vars
      • P(b);OGATE::QAR(E),XQ(b)
      • P(b);OGATE::QAR(E),XR(b)
      • Q(f);N_GUARD::R(H)+S(G)
      • R(c);N_GUARD,SBLOCK::R(C)
      • R(e);N_GUARD::R(H)+S(G)
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