MESON Chess Problem Database

Problem Display
PID: 21761 (8/4pq2/3p4/4kPP1/2b2R2/6Bp/2N1rP1K/7Q w - - 0 1)

Thomson, Robert Gavin

1st Prize, Chess Amateur (The), 1921

8/4pq2/3p4/4kPP1/2b2R2/6Bp/2N1rP1K/7Q

#2

8 + 7

3098 FIDE Album (1914-1944) (I) 1971
56 The Problemist 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc2
      • 2.Qe4#
    • 1...Rd2
      • 2.Qe4#
    • 1...Rxf2+
      • 2.Rxf2#
    • 1...Re4
      • 2.Qxe4#
    • 1...Bd5
      • 2.Qa1#
  • Tries
    • 1.Re4+?
      • 1...Kd5
        • 2.Re5#
      • 1...Kxf5!
    • 1.Qc6?
      • threat
        • 2.Rf3#
      • 1...Rxf2+
        • 2.Rxf2#
      • 1...Qxf5
        • 2.Re4#
      • 1...Rxc2
        • 2.Qe4#
      • 1...Re4
        • 2.Qxe4#
      • 1...Bd5
        • 2.Qc3#
      • 1...d5
        • 2.Qc7#
      • 1...Qd5!
    • 1.Qb7?
      • threat
        • 2.Rf3#
      • 1...Rxf2+
        • 2.Rxf2#
      • 1...Qxf5
        • 2.Re4#
      • 1...Rxc2
        • 2.Qe4#
      • 1...d5
        • 2.Qc7#
        • 2.Qb8#
      • 1...Re4
        • 2.Qxe4#
      • 1...Bd5
        • 2.Qb2#
      • 1...Qd5!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Rf3#
      • 1...Rxf2+
        • 2.Rxf2#
      • 1...Qxf5
        • 2.Re4#
      • 1...Rxc2
        • 2.Qe4#
      • 1...d5
        • 2.Qb8#
      • 1...Qd5
        • 2.Qh8#
      • 1...Re4
        • 2.Qxe4#
      • 1...Bd5
        • 2.Qa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(a);N_GUARD,XS(B)::QAR1(A)
    • R(a);N_GUARD::QAR1(A)
    • R(a);CHECK,OGATE,XP(C)::B(E)+R(F),XR(a)
    • R(a);N_GUARD,N_PINP(C)::QAR1(A),XR(a)
    • B(c);SBLOCK::QAB(A)
  • Tries
    • Try
      • R(F);CHECK
      • Vars
        • K(d);P-FLIGHT::QAB(A)+R(F),DCHECK
      • Refutation
        • K(d);P-FLIGHT,XP(G)
    • Try
      • Q(A);
      • Threat
        • B(E)+R(F)
      • Vars
        • R(a);CHECK,OGATE,XP(C)::B(E)+R(F),XR(a)
        • Q(g);SBLOCK,XP(G)::B(E)+R(F),DCHECK
        • R(a);N_GUARD,XS(B)::QAR1(A)
        • R(a);N_GUARD,N_PINP(C)::QAR1(A),XR(a)
        • B(c);OGATE,SBLOCK::QAB(A)
        • P(e);OGATEB,SBLOCK::QAB(A)
      • Refutation
        • Q(g);
    • Try
      • Q(A);
      • Threat
        • B(E)+R(F)
      • Vars
        • R(a);CHECK,OGATE,XP(C)::B(E)+R(F),XR(a)
        • Q(g);SBLOCK,XP(G)::B(E)+R(F),DCHECK
        • R(a);N_GUARD,XS(B)::QAR1(A)
        • R(a);N_GUARD,N_PINP(C)::QAR1(A),XR(a)
        • B(c);SBLOCK::QAB(A)
      • Refutation
        • Q(g);
  • Actual
    • Q(A);
    • Threat
      • B(E)+R(F)
    • Vars
      • R(a);CHECK,OGATE,XP(C)::B(E)+R(F),XR(a)
      • Q(g);SBLOCK,XP(G)::B(E)+R(F),DCHECK
      • R(a);N_GUARD,XS(B)::QAR1(A)
      • P(e);OGATEB,SBLOCK::QAB(A)
      • Q(g);N_GUARD,SBLOCK::QAB(A)
      • R(a);N_GUARD,N_PINP(C)::QAR1(A),XR(a)
      • B(c);SBLOCK::QAB(A)
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