MESON Chess Problem Database

Problem Display
PID: 51589 (2N2B2/1rp2p2/1p4RQ/3kpP1N/2b4R/1n6/r1n1P2K/1B6 w - - 0 1)

Lawson, M

The Guardian, 1966

2N2B2/1rp2p2/1p4RQ/3kpP1N/2b4R/1n6/r1n1P2K/1B6

#2

10 + 10

5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Scd4
      • 2.Be4#
    • 1...Sbd4
      • 2.e4#
    • 1...Sc5
      • 2.Se7#
    • 1...c5
      • 2.Rd6#
    • 1...c6
      • 2.Sf6#
  • Tries
    • 1.Rd6+?
      • 1...cxd6
        • 2.Qxd6#
      • 1...Kc5!
    • 1.Re6?
      • threat
        • 2.Sf6#
      • 1...fxe6
        • 2.Qxe6#
      • 1...f6
        • 2.Sxf6#
      • 1...e4!
    • 1.Qe3?
      • threat
        • 2.Se7#
        • 2.Qe4#
      • 1...fxg6
        • 2.Qe4#
      • 1...e4
        • 2.Qxe4#
      • 1...f6
        • 2.Qe4#
      • 1...Bd3
        • 2.Se7#
      • 1...Scd4
        • 2.Be4#
        • 2.Qe4#
      • 1...Sd2
        • 2.Se7#
      • 1...Sbd4
        • 2.Qe4#
      • 1...Sc5
        • 2.Se7#
      • 1...c5
        • 2.Rd6#
        • 2.Qe4#
      • 1...c6
        • 2.Sf6#
        • 2.Rd6#
        • 2.Qe4#
      • 1...Sxe3!
    • 1.Qh7?
      • threat
        • 2.Qxf7#
      • 1...fxg6
        • 2.Qd7#
      • 1...f6
        • 2.Qd7#
      • 1...Scd4
        • 2.Be4#
      • 1...Sbd4
        • 2.e4#
      • 1...Sc5
        • 2.Se7#
      • 1...c5
        • 2.Rd6#
      • 1...c6
        • 2.Sf6#
      • 1...e4!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qxf7#
      • 1...fxg6
        • 2.Qd7#
      • 1...f6
        • 2.Qd7#
      • 1...Scd4
        • 2.Be4#
      • 1...Sbd4
        • 2.e4#
      • 1...Sc5
        • 2.Se7#
      • 1...e4
        • 2.Sf4#
      • 1...c5
        • 2.Rd6#
      • 1...c6
        • 2.Sf6#

Anticipated by 6411(1929)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(b);OGATE,P_PINP(B),SBLOCK::B(A)
    • S(c);SBLOCK::P(B)
    • S(c);SBLOCK::S(I)
    • P(i);N_GUARD,SBLOCK::R1(G)
    • P(i);SBLOCK::S(F)
  • Tries
    • Try
      • R(G);CHECK
      • Vars
        • P(i);OGATE,XR(G)::QAR1(H),XP(i)
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • R(G);
      • Threat
        • S(F)
      • Vars
        • P(j);OGATE,XR(G)::QAB1(H),XP(j)
        • P(j);::S(F),XP(j)
      • Refutation
        • P(f);
    • Try
      • Q(H);
      • Threat
        • DUALS(2)
      • Vars
        • P(j);XR(G)::QAB1(H)
        • P(f);::QAB1(H),XP(f)
        • P(j);::QAB1(H)
        • B(d);::S(I)
        • S(c);::S(I)
        • S(c);::QAB1(H)
      • Refutation
        • S(b);P_PINP(B),XQ(H)
    • Try
      • Q(H);
      • Threat
        • QAB(H),XP(j)
      • Vars
        • P(j);OGATE,XR(G)::QAR2(H)
        • P(j);OGATE::QAR2(H)
        • S(b);OGATE,P_PINP(B),SBLOCK::B(A)
        • S(c);SBLOCK::P(B)
        • S(c);SBLOCK::S(I)
        • P(i);N_GUARD,SBLOCK::R1(G)
        • P(i);SBLOCK::S(F)
      • Refutation
        • P(f);
  • Actual
    • Q(H);
    • Threat
      • QAB(H),XP(j)
    • Vars
      • P(j);OGATE,XR(G)::QAR2(H)
      • P(j);OGATE::QAR2(H)
      • S(b);OGATE,P_PINP(B),SBLOCK::B(A)
      • S(c);SBLOCK::P(B)
      • S(c);SBLOCK::S(I)
      • P(f);N_GUARD,SBLOCK::S(F)
      • P(i);N_GUARD,SBLOCK::R1(G)
      • P(i);SBLOCK::S(F)
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