MESON Chess Problem Database

Problem Display
PID: 227410 (7n/2pR4/5k1p/3p1pNP/1N1PpQ2/6BK/b7/1r4R1 w - - 0 1)

Lee, LE

Sunday Chronicle, 1947

(First published on Sun Apr 20 1947)

7n/2pR4/5k1p/3p1pNP/1N1PpQ2/6BK/b7/1r4R1

#2

9 + 9

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rb3
      • 2.Sxd5#
    • 1...Sg6
      • 2.Rf7#
    • 1...Sf7
      • 2.Rxf7#
    • 1...hxg5
      • 2.Qe5#
  • Tries
    • 1.Be1?
      • threat
        • 2.Qe5#
      • 1...Sf7
        • 2.Rxf7#
      • 1...Sg6
        • 2.Rf7#
      • 1...Rb3+!
    • 1.Bh4?
      • threat
        • 2.Qe5#
      • 1...Sf7
        • 2.Rxf7#
      • 1...Sg6
        • 2.Rf7#
      • 1...Rb3+!
    • 1.Rf1?
      • threat
        • 2.Qxf5#
      • 1...Sf7
        • 2.Rxf7#
      • 1...Rxf1!
    • 1.Rg7?
      • threat
        • 2.Qe5#
      • 1...Sf7
        • 2.Rxf7#
      • 1...Sg6
        • 2.Rf7#
      • 1...Kxg7!
    • 1.Qd2?
      • threat
        • 2.Be5#
      • 1...Sf7
        • 2.Rxf7#
      • 1...f4
        • 2.Qxf4#
      • 1...Rb3
        • 2.Sxd5#
      • 1...Sg6
        • 2.Rf7#
      • 1...hxg5!
    • 1.Qe3?
      • threat
        • 2.Be5#
      • 1...Sf7
        • 2.Rxf7#
      • 1...f4
        • 2.Qxf4#
      • 1...Sg6
        • 2.Rf7#
      • 1...hxg5!
    • 1.Qh4?
      • threat
        • 2.Be5#
      • 1...Sf7
        • 2.Rxf7#
      • 1...f4
        • 2.Qxf4#
      • 1...Rb3
        • 2.Sxd5#
      • 1...Sg6
        • 2.Rf7#
      • 1...hxg5!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Be5#
      • 1...hxg5
        • 2.Qc6#
      • 1...Sf7
        • 2.Rxf7#
      • 1...f4
        • 2.Qxf4#
      • 1...Rb3
        • 2.Sxd5#
      • 1...Sg6
        • 2.Rf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(a);P_PINB(B),S_CUTB(b)::S(D),XP(d)
    • S(i);N_GUARD::R1(I)
    • S(i);N_GUARD::R1(I),XS(i)
    • P(g);SBLOCK,XS(G)::QAB1(F)
  • Tries
    • Try
      • B(B);
      • Threat
        • QAB1(F)
      • Vars
        • S(i);N_GUARD::R1(I),XS(i)
        • S(i);N_GUARD::R1(I)
      • Refutation
        • R(a);CHECK
    • Try
      • B(B);
      • Threat
        • QAB1(F)
      • Vars
        • S(i);N_GUARD::R1(I),XS(i)
        • S(i);N_GUARD::R1(I)
      • Refutation
        • R(a);CHECK
    • Try
      • R(A);
      • Threat
        • QAR1(F),XP(e)
      • Vars
        • S(i);N_GUARD::R1(I),XS(i)
      • Refutation
        • R(a);XR(A)
    • Try
      • R(I);
      • Threat
        • QAB1(F)
      • Vars
        • S(i);N_GUARD::R1(I),XS(i)
        • S(i);N_GUARD::R1(I)
      • Refutation
        • K(f);N_SPINP(e),S_FLIGHT,XR(I)
    • Try
      • Q(F);N_PINP(e)
      • Threat
        • B(B)
      • Vars
        • S(i);N_GUARD::R1(I),XS(i)
        • P(e);OGATEB::QAR2(F),XP(e)
        • R(a);P_PINB(B),S_CUTB(b)::S(D),XP(d)
        • S(i);N_GUARD::R1(I)
      • Refutation
        • P(g);XS(G)
    • Try
      • Q(F);N_PINP(e)
      • Threat
        • B(B)
      • Vars
        • S(i);N_GUARD::R1(I),XS(i)
        • P(e);OGATEB::QAR2(F),XP(e)
        • S(i);N_GUARD::R1(I)
      • Refutation
        • P(g);XS(G)
    • Try
      • Q(F);N_PINP(e)
      • Threat
        • B(B)
      • Vars
        • S(i);N_GUARD::R1(I),XS(i)
        • P(e);OGATEB::QAR2(F),XP(e)
        • R(a);P_PINB(B),S_CUTB(b)::S(D),XP(d)
        • S(i);N_GUARD::R1(I)
      • Refutation
        • P(g);P_SPINP(g),XS(G)
  • Actual
    • Q(F);N_PINP(e)
    • Threat
      • B(B)
    • Vars
      • P(g);SBLOCK,XS(G)::QAR(F)
      • S(i);N_GUARD::R1(I),XS(i)
      • P(e);OGATEB::QAR2(F),XP(e)
      • R(a);P_PINB(B),S_CUTB(b)::S(D),XP(d)
      • S(i);N_GUARD::R1(I)
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