MESON Chess Problem Database

Problem Display
PID: 168288 (R3Bb2/1pr5/b1q2p2/8/knNNQ3/p4KR1/8/4B3 w - - 0 1)

Petite, Efren

2nd HM., Birnov MT, 2005

R3Bb2/1pr5/b1q2p2/8/knNNQ3/p4KR1/8/4B3

#2

8 + 9

5454 Near Snap 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qb5
      • 2.Bxb5#
    • 1...Sa2
      • 2.Sb6#
    • 1...Sc2
      • 2.Sb6#
    • 1...Sd3
      • 2.Sb6#
    • 1...Sd5
      • 2.Qc2#
  • Tries
    • 1.Kf2?
      • threat
        • 2.Rxa3#
      • 1...Sa2
        • 2.Sb6#
        • 2.Qc2#
      • 1...Sc2
        • 2.Sb6#
        • 2.Qxc2#
      • 1...Sd5
        • 2.Qc2#
      • 1...a2
        • 2.Ra3#
      • 1...Sd3+!
    • 1.Kg2?
      • threat
        • 2.Rxa3#
      • 1...Sa2
        • 2.Sb6#
      • 1...Sc2
        • 2.Sb6#
      • 1...Sd3
        • 2.Sb6#
      • 1...Sd5
        • 2.Qc2#
      • 1...a2
        • 2.Ra3#
      • 1...Rg7!
    • 1.Rxa6+?
      • 1...Sxa6
        • 2.Sb6#
      • 1...bxa6!
  • Keys
    • 1.Ke2!
      • threat
        • 2.Rxa3#
      • 1...Sa2
        • 2.Qc2#
      • 1...Sc2
        • 2.Qxc2#
      • 1...Sd3
        • 2.Sb6#
      • 1...Sd5
        • 2.Qc2#
      • 1...a2
        • 2.Ra3#

Anticipated by 27294(1948)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • Q(e);N_PINQ(F),OGATE::B(H),XQ(e)
    • S(c);::S(D)
    • S(c);N_PINQ(F)::QAB(F)
  • Tries
    • Try
      • K(B);N_SPINQ(F),P-FLIGHT
      • Threat
        • R1(C),XP(a)
      • Vars
        • S(c);N_GUARD::QAB(F)
        • P(a);::R1(C)
      • Refutation
        • S(c);CHECK
    • Try
      • K(B);S_FLIGHT
      • Threat
        • R1(C),XP(a)
      • Vars
        • S(c);::S(D)
        • S(c);N_PINQ(F)::QAB(F)
        • P(a);::R1(C)
      • Refutation
        • R(h);P_PINR(C)
    • Try
      • R(G);CHECK,XB(d)
      • Vars
        • S(c);XR(G)::S(D)
      • Refutation
        • P(g);XR(G)
  • Actual
    • K(B);N_SPINQ(F),P_SPINS(D),S_FLIGHT
    • Threat
      • R1(C),XP(a)
    • Vars
      • S(c);N_GUARD::QAB(F)
      • S(c);N_GUARD::QAB(F),XS(c)
      • S(c);N_PINS(D)::S(D)
      • P(a);::R1(C)
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