MESON Chess Problem Database

Problem Display
PID: 84796 (8/2N2p2/1R1R1K2/2p4p/pPkP4/1p5Q/4p3/r1n1N3 w - - 0 1)

Petite, Efren

Revista Romana de Sah, 1987

8/2N2p2/1R1R1K2/2p4p/pPkP4/1p5Q/4p3/r1n1N3

#2

8 + 9

6490 yacpdb 2009
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sa2
      • 2.Qd3#
    • 1...Sd3
      • 2.Qxd3#
    • 1...cxb4
      • 2.Rbc6#
    • 1...cxd4
      • 2.Rdc6#
  • Tries
    • 1.Sb5?
      • threat
        • 2.Qc3#
      • 1...Kxb4
        • 2.Qc3#
      • 1...cxb4
        • 2.Qc8#
      • 1...cxd4
        • 2.Rxd4#
      • 1...Sa2
        • 2.Sa3#
      • 1...Sd3!
    • 1.Qf5?
      • threat
        • 2.Qxc5#
      • 1...cxb4
        • 2.Rbc6#
        • 2.Qc5#
      • 1...cxd4
        • 2.Rdc6#
        • 2.Qc5#
      • 1...b2
        • 2.Qc2#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Kc3!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Qc3#
      • 1...Kxd4
        • 2.Qh4#
      • 1...cxb4
        • 2.Rxb4#
      • 1...cxd4
        • 2.Qc8#
      • 1...Sa2
        • 2.Qd3#
      • 1...Sd3
        • 2.Qxd3#

Anticipated by 238093(1954)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAB1(B)
    • S(b);N_GUARD::QAB1(B),XS(b)
    • P(g);OGATEB,SBLOCK,XP(C)::R(E)
    • P(g);OGATEB,SBLOCK,XP(D)::R(F)
  • Tries
    • Try
      • S(H);
      • Threat
        • QAR1(B)
      • Vars
        • K(f);P-FLIGHT,XP(C)::QAB1(B)
        • P(g);OGATEB,SBLOCK,XP(C)::QAR(B)
        • P(g);OGATE,XP(D)::R1(F),XP(g)
        • S(b);S_CUTR(a)::S(H)
      • Refutation
        • S(b);
    • Try
      • Q(B);
      • Threat
        • QAR1(B),XP(g)
      • Vars
        • P(d);N_GUARD::QAR2(B)
        • S(b);N_GUARD::QAB1(B),XS(b)
      • Refutation
        • K(f);P-FLIGHT
  • Actual
    • S(H);
    • Threat
      • QAR1(B)
    • Vars
      • K(f);OGATEB,P-FLIGHT,XP(D)::QAR(B)
      • P(g);OGATE,XP(C)::R1(E),XP(g)
      • P(g);OGATEB,SBLOCK,XP(D)::QAR(B)
      • S(b);N_GUARD::QAB1(B)
      • S(b);N_GUARD::QAB1(B),XS(b)
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