MESON Chess Problem Database

Problem Display
PID: 168462 (n1Q5/5p2/7P/r4P2/2pP1k1K/1n2NP1P/r7/4N1B1 w - - 0 1)

Petite, Efren

3rd HM., Lindgren (F) MT, 1959

n1Q5/5p2/7P/r4P2/2pP1k1K/1n2NP1P/r7/4N1B1

#2

10 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.S3g2#
    • 1...Rg2
      • 2.S3xg2#
    • 1...R2a3
      • 2.S3g2#
    • 1...R2a4
      • 2.S3g2#
    • 1...R5a3
      • 2.Sd5#
    • 1...R5a4
      • 2.Sd5#
    • 1...Rd5
      • 2.Sxd5#
    • 1...Rxf5
      • 2.Qxf5#
    • 1...Ra6
      • 2.Sd5#
    • 1...Ra7
      • 2.Sd5#
    • 1...Sd2
      • 2.S3g2#
    • 1...Sc5
      • 2.Sd5#
  • Tries
    • 1.S3c2?
      • threat
        • 2.Bh2#
        • 2.Be3#
      • 1...Sxd4
        • 2.Bh2#
      • 1...Re5
        • 2.Bh2#
      • 1...Rxc2!
    • 1.Qe6?
      • threat
        • 2.Qe4#
      • 1...Re5
        • 2.Qxe5#
      • 1...Sd2
        • 2.S3g2#
        • 2.Bh2#
      • 1...Sc5
        • 2.Sd5#
        • 2.Qe5#
        • 2.Qd6#
      • 1...fxe6!
    • 1.Qc7+?
      • 1...Re5
        • 2.Qxe5#
      • 1...Sxc7!
    • 1.Qb8+?
      • 1...Re5
        • 2.Qxe5#
      • 1...Sc7!
    • 1.Qg8?
      • threat
        • 2.Qg3#
        • 2.Qg4#
        • 2.Qg5#
      • 1...Rxf5
        • 2.Qg3#
        • 2.Qg4#
      • 1...Sxd4
        • 2.Qg3#
      • 1...Rf2
        • 2.Qg5#
      • 1...f6
        • 2.Qg3#
        • 2.Qg4#
      • 1...Rg2!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qe4#
      • 1...Re5
        • 2.Qxe5#
      • 1...Sd2
        • 2.Bh2#
      • 1...Sc5
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 10
  • Sets
    • R(a);N_GUARD::S(C)
    • R(a);N_GUARD::S(C),XR(a)
    • R(e);N_GUARD::S(C)
    • R(e);N_GUARD::S(C),XR(e)
    • R(e);OGATE,XP(H)::QAR1(J),XR(e)
    • S(b);S_CUTR(a)::S(C)
    • S(b);S_CUTR(e)::S(C)
  • Tries
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);XP(F)::B(B)
        • R(e);::B(B)
      • Refutation
        • R(a);XS(C)
    • Try
      • Q(J);
      • Threat
        • QAR1(J)
      • Vars
        • R(e);N_GUARD::QAB1(J),XR(e)
      • Refutation
        • P(f);XQ(J)
    • Try
      • Q(J);CHECK
      • Vars
        • R(e);N_GUARD,P_SPINR(e)::QAB1(J),XR(e)
      • Refutation
        • S(g);XQ(J)
    • Try
      • Q(J);CHECK
      • Vars
        • R(e);N_GUARD,P_SPINR(e)::QAB1(J),XR(e)
      • Refutation
        • S(g);P_SPINS(g)
    • Try
      • Q(J);
      • Threat
        • DUALS(3)
      • Vars
        • S(b);XP(F)::QAB1(J)
        • R(a);::QAB1(J)
      • Refutation
        • R(a);
  • Actual
    • Q(J);
    • Threat
      • QAR1(J)
    • Vars
      • R(e);N_GUARD::QAB1(J),XR(e)
      • S(b);S_CUTR(a)::B(B)
      • S(b);S_CUTR(e)::QAB1(J)
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