MESON Chess Problem Database

Problem Display
PID: 81978 (r1r5/3R2b1/p1p2p2/R1N1pp2/K1k5/2p5/6Qn/2n5 w - - 0 1)

Ahues, Herbert Siegfried Oskar

Canadian Chess Chat, 1981

r1r5/3R2b1/p1p2p2/R1N1pp2/K1k5/2p5/6Qn/2n5

#2

5 + 12

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bf8
      • 2.Qg8#
    • 1...Sa2
      • 2.Qxa2#
      • 2.Qe2#
    • 1...Se2
      • 2.Qxe2#
    • 1...Sb3
      • 2.Qe2#
    • 1...Sd3
      • 2.Qa2#
    • 1...c2
      • 2.Qxc2#
    • 1...f4
      • 2.Qe4#
  • Tries
    • 1.Sb3?
      • threat
        • 2.Rc5#
      • 1...Sxb3
        • 2.Qe2#
      • 1...Bf8
        • 2.Qg8#
      • 1...c5
        • 2.Qd5#
      • 1...Sd3!
    • 1.Sd3?
      • threat
        • 2.Rc5#
      • 1...Sxd3
        • 2.Qa2#
      • 1...Bf8
        • 2.Qg8#
      • 1...c5
        • 2.Qd5#
      • 1...Sb3!
    • 1.Se4?
      • threat
        • 2.Rc5#
      • 1...fxe4
        • 2.Qxe4#
      • 1...Bf8
        • 2.Qg8#
      • 1...Sb3
        • 2.Qe2#
      • 1...Sd3
        • 2.Qa2#
      • 1...c5!
    • 1.Sxa6?
      • threat
        • 2.Rc5#
      • 1...Bf8
        • 2.Qg8#
      • 1...Sb3
        • 2.Qe2#
      • 1...Sd3
        • 2.Qa2#
      • 1...c5
        • 2.Qd5#
      • 1...Rxa6!
    • 1.Se6?
      • threat
        • 2.Rc5#
      • 1...Sb3
        • 2.Qe2#
      • 1...Sd3
        • 2.Qa2#
      • 1...c5
        • 2.Qd5#
      • 1...Bf8!
    • 1.Qf1+?
      • 1...Se2
        • 2.Qxe2#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Sxf1!
    • 1.Qa2+?
      • 1...Sb3
        • 2.Qxb3#
        • 2.Qe2#
      • 1...Sxa2!
    • 1.Qe2+?
      • 1...Sd3
        • 2.Qxd3#
        • 2.Qa2#
      • 1...Sxe2!
  • Keys
    • 1.Sb7!
      • threat
        • 2.Rc5#
      • 1...Bf8
        • 2.Qg8#
      • 1...Sb3
        • 2.Qe2#
      • 1...Sd3
        • 2.Qa2#
      • 1...c5
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • B(j);OGATE::QAB(A)
    • S(a);N_GUARD::QAB(A),XS(a)
    • S(a);N_GUARD::QAB(A)
    • P(c);OGATEB::QAR2(A),XP(c)
    • P(f);N_GUARD::QAR2(A)
  • Tries
    • Try
      • S(D);
      • Threat
        • R1(C)
      • Vars
        • S(a);N_GUARD,XS(D)::QAB(A)
        • B(j);OGATE::QAB(A)
        • P(h);N_GUARD::QAB1(A)
      • Refutation
        • S(a);
    • Try
      • S(D);
      • Threat
        • R1(C)
      • Vars
        • S(a);N_GUARD,XS(D)::QAB(A)
        • B(j);OGATE::QAB(A)
        • P(h);N_GUARD::QAB1(A)
      • Refutation
        • S(a);
    • Try
      • S(D);
      • Threat
        • R1(C)
      • Vars
        • P(f);OGATE,XS(D)::QAR2(A),XP(f)
        • B(j);OGATE::QAB(A)
        • S(a);N_GUARD::QAB(A)
      • Refutation
        • P(h);
    • Try
      • S(D);XP(g)
      • Threat
        • R1(C)
      • Vars
        • B(j);OGATE::QAB(A)
        • S(a);N_GUARD::QAB(A)
        • P(h);N_GUARD::QAB1(A)
      • Refutation
        • R(k);P_PINR(C),XS(D)
    • Try
      • S(D);
      • Threat
        • R1(C)
      • Vars
        • S(a);N_GUARD::QAB(A)
        • P(h);N_GUARD::QAB1(A)
      • Refutation
        • B(j);
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB(A),XS(a)
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • S(b);XQ(A)
    • Try
      • Q(A);CHECK
      • Refutation
        • S(a);XQ(A)
    • Try
      • Q(A);CHECK
      • Refutation
        • S(a);XQ(A)
  • Actual
    • S(D);
    • Threat
      • R1(C)
    • Vars
      • B(j);OGATE::QAB(A)
      • S(a);N_GUARD::QAB(A)
      • P(h);N_GUARD::QAB1(A)
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