MESON Chess Problem Database

Problem Display
PID: 98314 (8/qp3B2/3B4/p1P5/p5R1/k1pN4/PNb1nK2/7Q w - - 0 1)

May, Willy Paul

Problem (Zagreb), 1951

8/qp3B2/3B4/p1P5/p5R1/k1pN4/PNb1nK2/7Q

#2

9 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc5+
      • 2.Bxc5#
    • 1...Qb6
      • 2.cxb6#
    • 1...Qa6
      • 2.c6#
    • 1...Qa8
      • 2.c6#
    • 1...Bb1
      • 2.Rxa4#
    • 1...b5
      • 2.cxb5 ep#
    • 1...b6
      • 2.cxb6#
      • 2.c6#
  • Tries
    • 1.Qb1?
      • threat
        • 2.Sc4#
      • 1...Qxc5+
        • 2.Bxc5#
      • 1...Bxb1
        • 2.Rxa4#
      • 1...Bxd3
        • 2.Rxa4#
      • 1...cxb2
        • 2.Qxb2#
      • 1...Qa6
        • 2.c6#
      • 1...b5
        • 2.cxb5 ep#
      • 1...Bb3!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Sc4#
      • 1...Qxc5+
        • 2.Bxc5#
      • 1...Bxd3
        • 2.Rxa4#
      • 1...cxb2
        • 2.Qxb2#
      • 1...Qa6
        • 2.c6#
      • 1...Bb3
        • 2.axb3#
      • 1...b5
        • 2.cxb5 ep#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(g);CHECK,OGATE,P_SPINQ(g),XP(G)::B(H),XQ(g)
    • Q(g);::B(H)+P(G),XQ(g)
    • Q(g);N_PINP(G)::B(H)+P(G)
    • B(a);N_GUARD::R1(F),XP(e)
    • P(h);::B(H)+P(G),XP(h),EP
  • Tries
    • Try
      • Q(A);
      • Threat
        • S(C)
      • Vars
        • Q(g);CHECK,OGATE,P_SPINQ(g),XP(G)::B(H),XQ(g)
        • B(a);N_GUARD,XQ(A)::R1(F),XP(e)
        • B(a);N_GUARD,XS(E)::R1(F),XP(e)
        • P(d);OGATE,XS(C)::QAB1(A),XP(d)
        • Q(g);N_PINP(G)::B(H)+P(G)
        • P(h);::B(H)+P(G),XP(h),EP
      • Refutation
        • B(a);
  • Actual
    • Q(A);
    • Threat
      • S(C)
    • Vars
      • Q(g);CHECK,OGATE,P_SPINQ(g),XP(G)::B(H),XQ(g)
      • B(a);N_GUARD,XS(E)::R1(F),XP(e)
      • P(d);OGATE,XS(C)::QAB1(A),XP(d)
      • Q(g);N_PINP(G)::B(H)+P(G)
      • B(a);OGATE::QAR(A)+P(B),XB(a)
      • P(h);::B(H)+P(G),XP(h),EP
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