MESON Chess Problem Database

Problem Display
PID: 17733 (2B1nK2/5p2/4qP1R/8/3N2kP/2pP2Bp/4PP1n/1b1Q3r w - - 0 1)

Mansfield, Comins

Chess, 1949

2B1nK2/5p2/4qP1R/8/3N2kP/2pP2Bp/4PP1n/1b1Q3r

#2

11 + 9

55 The Observer 1949
3550 Complete Mansfield/II 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Qf5
      • 2.Bxf5#
    • 1...Qd7
      • 2.Bxd7#
    • 1...Sf1
      • 2.e3#
      • 2.e4#
    • 1...Sf3
      • 2.exf3#
  • Tries
    • 1.Sc2?
      • threat
        • 2.Se3#
      • 1...Kf5
        • 2.Se3#
        • 2.e4#
      • 1...Sf1
        • 2.e4#
      • 1...Bxc2!
    • 1.Bxh2?
      • threat
        • 2.f3#
      • 1...Rxh2
        • 2.e3#
      • 1...Rf1!
    • 1.Qc1?
      • threat
        • 2.Qf4#
        • 2.Qg5#
      • 1...Sf3
        • 2.Qf4#
        • 2.exf3#
      • 1...Rxc1!
    • 1.Qd2?
      • threat
        • 2.Qf4#
        • 2.Qg5#
      • 1...Sf3
        • 2.Qf4#
        • 2.exf3#
      • 1...cxd2!
    • 1.e3+?
      • 1...Sf3
        • 2.Qxf3#
      • 1...Rxd1!
    • 1.e4+?
      • 1...Sf3
        • 2.Qxf3#
      • 1...Rxd1!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Se3#
      • 1...Qd6+
        • 2.Sxd6#
      • 1...Qe7+
        • 2.Sxe7#
      • 1...Kxf5
        • 2.e4#
      • 1...Qxf5
        • 2.Qa4#
      • 1...Qxe2
        • 2.Sd4#
      • 1...Qe3
        • 2.Sxe3#
      • 1...Sf1
        • 2.e4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 2
  • Sets
    • Q(g);OGATE::B(J),XQ(g)
    • Q(g);OGATEB::B(J),XQ(g)
    • S(c);OGATE::P(B),XS(c)
  • Tries
    • Try
      • S(F);
      • Threat
        • S(F)
      • Vars
        • S(c);N_GUARD,S_CUTR(b)::QAB(A)+P(B)
      • Refutation
        • B(a);XS(F)
    • Try
      • B(E);XS(c)
      • Threat
        • P(C)
      • Vars
        • R(b);N_GUARD,XB(E)::QAB(A)+P(B)
      • Refutation
        • R(b);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Refutation
        • R(b);XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Refutation
        • P(d);XQ(A)
    • Try
      • P(B);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAB1(A),XS(c)
      • Refutation
        • R(b);XQ(A)
    • Try
      • P(B);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAB1(A),XS(c)
      • Refutation
        • R(b);XQ(A)
  • Actual
    • S(F);N_PINQ(g)
    • Threat
      • S(F)
    • Vars
      • Q(g);CHECK::B(J)+S(F),XQ(g)
      • K(f);P_SPINQ(g),S_FLIGHT,XS(F)::P(B)
      • Q(g);N_GUARD,P_SPINQ(g),XS(F)::QAR(A)
      • Q(g);P_SPINQ(g),XP(B)::B(J)+S(F)
      • Q(g);::B(J)+S(F),DCHECK,XQ(g)
      • S(c);N_GUARD,S_CUTR(b)::QAB(A)+P(B)
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