MESON Chess Problem Database

Problem Display
PID: 260734 (8/2B3K1/3pp1P1/rnb1k3/2p2NRN/2RQq1p1/4n1B1/4r3 w - - 0 1)

Lipton, Michael

Rice, John Michael

The Problemist, 1970

8/2B3K1/3pp1P1/rnb1k3/2p2NRN/2RQq1p1/4n1B1/4r3

#2

9 + 11

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.Sf3#
      • 2.Qe4#
    • 1...Qg1
      • 2.Sf3#
      • 2.Qe4#
    • 1...Qd2
      • 2.Sf3#
      • 2.Qe4#
    • 1...Qf2
      • 2.Qe4#
    • 1...Qd4
      • 2.Sf3#
    • 1...Qf3
      • 2.Sxf3#
    • 1...Qe4
      • 2.Qxe4#
    • 1...Ba3
      • 2.Qxe3#
    • 1...Bb4
      • 2.Qxe3#
    • 1...Sxf4
      • 2.Rg5#
    • 1...Sd4
      • 2.Qxe3#
  • Tries
    • 1.Bxd6+?
      • 1...Bxd6
        • 2.Qxe3#
      • 1...Sxd6!
    • 1.Rxc4?
      • threat
        • 2.Rg5#
      • 1...Qxf4
        • 2.Rxc5#
      • 1...Qxd3
        • 2.Sxd3#
      • 1...Qd4
        • 2.Sf3#
      • 1...Qe4
        • 2.Rxe4#
        • 2.Qxe4#
      • 1...Sed4
        • 2.Rxc5#
      • 1...Sbd4
        • 2.Qxe3#
      • 1...Bd4!
    • 1.Qf5+?
      • 1...Kd4
        • 2.Sxe2#
      • 1...exf5!
  • Keys
    • 1.Qxc4!
      • threat
        • 2.Rg5#
      • 1...Qxf4
        • 2.Qxc5#
      • 1...Qd4
        • 2.Qxe6#
      • 1...Qd3
        • 2.Sxd3#
      • 1...Qe4
        • 2.Qxe4#
      • 1...Bd4
        • 2.Qxe6#
      • 1...Sed4
        • 2.Qxc5#
      • 1...Sbd4
        • 2.Rxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • Q(c);N_GUARD::QAR1(C)
    • Q(c);N_GUARD::S(F)
    • Q(c);N_GUARD::S(F),XQ(c)
    • Q(c);N_GUARD::QAR1(C),XQ(c)
    • B(h);N_GUARD::QAR2(C),XQ(c)
    • S(b);SBLOCK,XS(D)::R(E)
    • S(g);S_CUTB(h)::QAR2(C),XQ(c)
  • Tries
    • Try
      • B(H);CHECK,XP(j)
      • Vars
        • B(h);SBLOCK,XB(H)::QAR2(C),XQ(c)
      • Refutation
        • S(g);XB(H)
    • Try
      • R(B);XP(e)
      • Threat
        • R(E)
      • Vars
        • Q(c);N_GUARD,XS(D)::R(B),XB(h)
        • Q(c);XQ(C)::S(D),XQ(c)
        • Q(c);N_GUARD::S(F)
        • S(b);S_CUTQ(c)::R(B),XB(h)
        • S(g);S_CUTB(h)::QAR2(C),XQ(c)
      • Refutation
        • B(h);
    • Try
      • Q(C);CHECK
      • Vars
        • K(i);N_SPINP(j),S_FLIGHT::R(E)+S(D),DCHECK,XS(b)
      • Refutation
        • P(k);XQ(C)
  • Actual
    • Q(C);XP(e)
    • Threat
      • R(E)
    • Vars
      • Q(c);N_GUARD,XS(D)::QAR2(C),XB(h)
      • Q(c);SBLOCK::QAR1(C),XP(k)
      • Q(c);N_GUARD::S(D),XQ(c)
      • Q(c);N_GUARD::QAR1(C),XQ(c)
      • B(h);SBLOCK::QAR1(C),XP(k)
      • S(b);S_CUTQ(c)::QAR2(C),XB(h)
      • S(g);S_CUTB(h)::R(B),XQ(c)
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